Ben Waugh
University College London
H-index: 85
Europe-United Kingdom
About Ben Waugh
Ben Waugh, With an exceptional h-index of 85 and a recent h-index of 74 (since 2020), a distinguished researcher at University College London, specializes in the field of particle physics, computing.
His recent articles reflect a diverse array of research interests and contributions to the field:
Search for non-resonant Higgs boson pair production in the 2b+ 2ℓ+ Emiss T fnal state in pp collisions at√ s= 13 TeV with the ATLAS detector
Search for magnetic monopoles and stable particles with high electric charges in = 13 TeV pp collisions with the ATLAS detector
Measurement of the cross-sections of the electroweak and total production of a Pair in Association With two Jets in Collisions at TeV with the ATLAS detector
Calibration of the light-flavour jet mistagging efficiency of the b-tagging algorithms with Z+ jets events using 139$$\textrm {fb}^{-1} $$ of ATLAS proton–proton collision data …
Measurement of cross sections for production of a Z boson in association with a flavor-inclusive or doubly b-tagged large-radius jet in proton-proton collisions at√ s= 13 TeV …
Search for top-philic heavy resonances in collisions at TeV with the ATLAS detector
Tools for estimating fake/non-prompt lepton backgrounds with the ATLAS detector at the LHC
Measurement of the c-jet mistagging efficiency in events using pp collision data at collected with the ATLAS detector
Ben Waugh Information
University | University College London |
|---|---|
Position | ___ |
Citations(all) | 31881 |
Citations(since 2020) | 19068 |
Cited By | 1923 |
hIndex(all) | 85 |
hIndex(since 2020) | 74 |
i10Index(all) | 221 |
i10Index(since 2020) | 202 |
University Profile Page | University College London |
Ben Waugh Skills & Research Interests
particle physics
computing
Top articles of Ben Waugh
Search for non-resonant Higgs boson pair production in the 2b+ 2ℓ+ Emiss T fnal state in pp collisions at√ s= 13 TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Didier Alexandre,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Gianluca Alimonti,John Alison,Steven Patrick Alkire,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,L Aperio Bella,Giorgi Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Andrei Artamonov,Giacomo Artoni,Sebastian Artz,Shoji Asai,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,R Avramidou,Mohamad Kassem Ayoub,Adam Maxwell Azoulay,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Milena Bajic,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek
Journal
Physics Letters B
Published Date
2020/2/10
A search for non-resonant Higgs boson pair production, as predicted by the Standard Model, is presented, where one of the Higgs bosons decays via the H→ b b channel and the other via one of the H→ W W⁎/Z Z⁎/τ τ channels. The analysis selection requires events to have at least two b-tagged jets and exactly two leptons (electrons or muons) with opposite electric charge in the final state. Candidate events consistent with Higgs boson pair production are selected using a multi-class neural network discriminant. The analysis uses 139 fb− 1 of pp collision data recorded at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. An observed (expected) upper limit of 1.2 (0.9− 0.3+ 0.4) pb is set on the non-resonant Higgs boson pair production cross-section at 95% confidence level, which is equivalent to 40 (29− 9+ 14) times the value predicted in the Standard Model.
Search for magnetic monopoles and stable particles with high electric charges in = 13 TeV pp collisions with the ATLAS detector
Authors
Georges Aad,B Abbott,Kira Abeling,Nils Julius Abicht,SH Abidi,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,C Adam Bourdarios,Leszek Adamczyk,SV Addepalli,MJ Addison,Jahred Adelman,Aytul Adiguzel,Tim Adye,AA Affolder,Yoav Afik,Merve Nazlim Agaras,Jinky Agarwala,Anamika Aggarwal,Catalin Agheorghiesei,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Sudha Ahuja,Xiaocong Ai,Giulio Aielli,Arya Aikot,M Ait Tamlihat,Brahim Aitbenchikh,Iakov Aizenberg,Melike Akbiyik,TPA Åkesson,AV Akimov,Daiya Akiyama,Nilima Nilesh Akolkar,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Pietro Albicocco,Guillaume Lucas Albouy,Sara Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Fabrizio Alfonsi,Malte Algren,Muhammad Alhroob,Babar Ali,HMJ Ali,Shahzad Ali,Samuel William Alibocus,Malik Aliev,Gianluca Alimonti,Wael Alkakhi,Corentin Allaire,BMM Allbrooke,Julia Frances Allen,CA Allendes Flores,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,M Alvarez Estevez,A Alvarez Fernandez,M Alves Cardoso,MG Alviggi,Mohamed Aly,Y Amaral Coutinho,Alessandro Ambler,Christoph Amelung,Maximilian Amerl,CG Ames,Dante Amidei,SP Amor Dos Santos,Kieran Robert Amos,Viktor Ananiev,Christos Anastopoulos,T Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,Fabio Anulli,Masato Aoki,Takumi Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Christian Appelt,Aram Apyan,N Aranzabal,SJ Arbiol Val,Chiara Arcangeletti,ATH Arce,Eloisa Arena,Jean-Francois Arguin,Spyros Argyropoulos,J-H Arling,Olivier Arnaez,Hannah Arnold,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Nedaa Alexandra Asbah,Jihad Assahsah,K Assamagan,Robert Astalos,S Atashi,Ryan Justin Atkin,M Atkinson,Hicham Atmani,PA Atmasiddha,Kamil Augsten,Silvia Auricchio,AD Auriol,Volker Andreas Austrup,Giuseppe Avolio,Konstantinos Axiotis,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Alexander Bachiu,F Backman,Anthony Badea,Paolo Bagnaia,Marzieh Bahmani,AJ Bailey,VR Bailey,JT Baines,Luke Baines,OK Baker,Evelin Bakos,D Bakshi Gupta,Veena Balakrishnan,Rahul Balasubramanian,EM Baldin,Petr Balek
Journal
Journal of high energy physics
Published Date
2023/11
We present a search for magnetic monopoles and high-electric-charge objects using LHC Run 2= 13 TeV proton-proton collisions recorded by the ATLAS detector. A total integrated luminosity of 138 fb− 1 was collected by a specialized trigger. No highly ionizing particle candidate was observed. Considering the Drell-Yan and photon-fusion pair production mechanisms as benchmark models, cross-section upper limits are presented for spin-0 and spin-1/2 magnetic monopoles of magnetic charge 1g D and 2g D and for high-electric-charge objects of electric charge 20≤| z|≤ 100, for masses between 200 GeV and 4000 GeV. The search improves by approximately a factor of three the previous cross-section limits on the Drell-Yan production of magnetic monopoles and high-electric charge objects. Also, the first ATLAS limits on the photon-fusion pair production mechanism of magnetic monopoles and high-electric …
Measurement of the cross-sections of the electroweak and total production of a Pair in Association With two Jets in Collisions at TeV with the ATLAS detector
Authors
Georges Aad,B Abbott,Kira Abeling,Nils Julius Abicht,SH Abidi,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,SV Addepalli,MJ Addison,Jahred Adelman,Aytül Adiguzel,Tim Adye,AA Affolder,Yoav Afik,Merve Nazlim Agaras,Jinky Agarwala,Anamika Aggarwal,Catalin Agheorghiesei,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Sudha Ahuja,Xiaocong Ai,Giulio Aielli,Arya Aikot,M Ait Tamlihat,Brahim Aitbenchikh,Iakov Aizenberg,Melike Akbiyik,TPA Åkesson,AV Akimov,Daiya Akiyama,Nilima Nilesh Akolkar,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Pietro Albicocco,Guillaume Lucas Albouy,Sara Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Fabrizio Alfonsi,Malte Algren,Muhammad Alhroob,Babar Ali,HMJ Ali,Shahzad Ali,Samuel William Alibocus,Malik Aliev,Gianluca Alimonti,Wael Alkakhi,Corentin Allaire,BMM Allbrooke,Julia Frances Allen,CA Allendes Flores,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,M Alvarez Estevez,A Alvarez Fernandez,M Alves Cardoso,MG Alviggi,Mohamed Aly,Y Amaral Coutinho,Alessandro Ambler,Christoph Amelung,Maximilian Amerl,CG Ames,Dante Amidei,SP Amor Dos Santos,Kieran Robert Amos,Viktor Ananiev,Christos Anastopoulos,T Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,Fabio Anulli,Masato Aoki,Takumi Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Christian Appelt,Aram Apyan,N Aranzabal,Chiara Arcangeletti,ATH Arce,Eloisa Arena,Jean-Francois Arguin,Spyros Argyropoulos,J-H Arling,Olivier Arnaez,Hannah Arnold,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Nedaa Alexandra Asbah,Jihad Assahsah,K Assamagan,Robert Astalos,S Atashi,Ryan Justin Atkin,M Atkinson,Hicham Atmani,PA Atmasiddha,Kamil Augsten,Silvia Auricchio,AD Auriol,Volker Andreas Austrup,Giuseppe Avolio,Konstantinos Axiotis,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Alexander Bachiu,F Backman,Anthony Badea,Paolo Bagnaia,Marzieh Bahmani,AJ Bailey,VR Bailey,JT Baines,Luke Baines,Christos Bakalis,OK Baker,Evelin Bakos,D Bakshi Gupta,Veena Balakrishnan,Rahul Balasubramanian
Journal
Physics Letters B
Published Date
2023/11/10
This Letter presents the measurement of the fiducial and differential cross-sections of the electroweak production of a Zγ pair in association with two jets. The analysis uses 140 fb− 1 of LHC proton–proton collision data taken at s= 13 TeV recorded by the ATLAS detector during the years 2015–2018. Events with a Z boson candidate decaying into either an e+ e− or μ+ μ− pair, a photon and two jets are selected. The electroweak component is extracted by requiring a large dijet invariant mass and by using the information about the centrality of the system and is measured with an observed and expected significance well above five standard deviations. The fiducial p p→ Z γ j j cross-section for the electroweak production is measured to be 3.6±0.5 fb. The total fiducial cross-section that also includes contributions where the jets arise from strong interactions is measured to be 16.8− 1.8+ 2.0 fb. The results are consistent …
Calibration of the light-flavour jet mistagging efficiency of the b-tagging algorithms with Z+ jets events using 139$$\textrm {fb}^{-1} $$ of ATLAS proton–proton collision data …
Authors
Georges Aad,B Abbott,DC Abbott,Kira Abeling,SH Abidi,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Hoffman,BS Acharya,C Adam Bourdarios,L Adamczyk,L Adamek,SV Addepalli,J Adelman,Aytül Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,MN Agaras,J Agarwala,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,S Ahuja,X Ai,G Aielli,M Ait Tamlihat,B Aitbenchikh,I Aizenberg,M Akbiyik,TPA Åkesson,AV Akimov,K Al Khoury,GL Alberghi,J Albert,P Albicocco,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,W Alkakhi,C Allaire,BMM Allbrooke,C Allendes Flores,PP Allport,A Aloisio,F Alonso,C Alpigiani,M Alvarez Estevez,A Alvarez Fernandez,MG Alviggi,M Aly,Y Amaral Coutinho,A Ambler,C Amelung,M Amerl,CG Ames,D Amidei,SP Santos,KR Amos,V Ananiev,C Anastopoulos,T Andeen,JK Anders,SY Andrean,A Andreazza,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,T Aoki,J Aparisi Pozo,MA Aparo,L Aperio Bella,C Appelt,N Aranzabal,V Araujo Ferraz,C Arcangeletti,ATH Arce,E Arena,J-F Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,O Arnaez,H Arnold,ZP Tame,G Artoni,H Asada,K Asai,S Asai,NA Asbah,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,S Auricchio,AD Auriol,VA Austrup,G Avner,G Avolio,K Axiotis,G Azuelos,D Babal,H Bachacou,K Bachas,A Bachiu,F Backman,A Badea,P Bagnaia,M Bahmani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,E Ballabene
Journal
The European Physical Journal C
Published Date
2023/8
The identification of b-jets, referred to as b-tagging, is an important part of many physics analyses in the ATLAS experiment at the Large Hadron Collider and an accurate calibration of its performance is essential for high-quality physics results. This publication describes the calibration of the light-flavour jet mistagging efficiency in a data sample of proton–proton collision events at TeV corresponding to an integrated luminosity of 139 fb. The calibration is performed in a sample of Z bosons produced in association with jets. Due to the low mistagging efficiency for light-flavour jets, a method which uses modified versions of the b-tagging algorithms referred to as flip taggers is used in this work. A fit to the jet-flavour-sensitive secondary-vertex mass is performed to extract a scale factor from data, to correct the light-flavour jet mistagging efficiency in Monte Carlo simulations, while simultaneously correcting the b …
Measurement of cross sections for production of a Z boson in association with a flavor-inclusive or doubly b-tagged large-radius jet in proton-proton collisions at√ s= 13 TeV …
Authors
P Jackson,AXY Kong,JL Oliver,TA Ruggeri,AS Sharma,MJ White,V Jain,SP Swift,DM Gingrich,JL Pinfold,H Wang,ORHAN Cakir,H Duran Yildiz,S Kuday,I Turk Cakir,S Sultansoy,C Adam Bourdarios,M Belfkir,N Berger,F Costanza,A Cueto,O Dartsi,M Delmastro,L Di Ciaccio,L Franco,C Goy,T Guillemin,T Hryn'Ova,S Jézéquel,I Koletsou,R Lafaye,J Levêque,N Lorenzo Martinez,L Portales,E Sauvan,I Wingerter-Seez,Y Abulaiti,DP Benjamin,VS Bhopatkar,S Chekanov,WH Hopkins,E Kourlitis,T LeCompte,J Love,J Metcalfe,AS Mete,A Paramonov,J Proudfoot,P Van Gemmeren,J Zhang,S Berlendis,E Cheu,CM Delitzsch,KA Johns,W Lampl,M LeBlanc,RE Lindley,P Loch,JP Rutherfoord,EW Varnes,H Zhou,Y Zhou,D Bakshi Gupta,B Burghgrave,K De,T Eifert,A Farbin,HK Hadavand,JD Little,N Ozturk,G Usai,A White,S Angelidakis,P Bellos,D Fassouliotis,I Gkialas,C Kourkoumelis,K Papageorgiou,T Alexopoulos,C Bakalis,N Benekos,EN Gazis,P Gkountoumis,C Kitsaki,A Koulouris,S Maltezos,C Paraskevopoulos,G Zacharis,T Andeen,CD Burton,K Choi,N Nikiforou,PUE Onyisi,H Potti,A Roy,M Unal,AF Webb,AJ Beddall,E Celebi,SA Cetin,S Simsek,Aytül Adiguzel,A Bayirli,S Gurbuz,S Istin,VE Ozcan,A Beddall,A Bingul,Z Uysal,F Khalil-Zada,D Bogavac,M Bosman,MP Casado,L Castillo Garcia,FA Forster,G Giannini,EL Gkougkousis,S Gonzalez Fernandez,C Grieco,S Grinstein,A Juste Rozas,S Kazakos,I Korolkov,M Martinez,LM Mir,C Moreno Martinez,JL Munoz Martinez,N Orlando,A Pacheco Pages,C Padilla Aranda,I Riu,R Rosten,A Salvador Salas,A Sonay,S Terzo,TR Van Daalen,D Vazquez Furelos,J Barreiro Guimaraes da Costa,HJ Cheng,X Chu,H Cui,Y Fang,JA Garcia Pascual,Hu YF,Y Huang,MG Kurth,M Li,Z Liang,P Liu,Y Liu
Journal
Physical Review D
Published Date
2023
We present measurements of cross sections for production of a leptonically decaying Z boson in association with a large-radius jet in 13 TeV proton-proton collisions at the LHC, using 36 fb - 1 of data from the ATLAS detector. Integrated and differential cross sections are measured at particle level in both a flavor inclusive and a doubly b -tagged fiducial phase space. The large-radius jet mass and transverse momentum, its kinematic relationship to the Z boson, and the angular separation of b -tagged small-radius track jets within the large-radius jet are measured. This measurement constitutes an important test of perturbative quantum chromodynamics in kinematic and flavor configurations relevant to several Higgs boson and beyond-Standard-Model physics analyses. The results highlight issues with modeling of additional hadronic activity in the flavor-inclusive selection, and a distinction between flavor-number schemes in the b -tagged phase space.
Search for top-philic heavy resonances in collisions at TeV with the ATLAS detector
Authors
Georges Aad,Braden Keim Abbott,Kira Abeling,Nils Julius Abicht,Haider Abidi,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Angel Abusleme,Bobby Samir Acharya,Claire Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Sagar Addepalli,Matt Addison,Jahred Adelman,Aytul Adiguzel,Sofia Adorni Braccesi Chiassi,Tim Adye,Tony Affolder,Yoav Afik,Merve Nazlim Agaras,Jinky Agarwala,Anamika Aggarwal,Catalin Agheorghiesei,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Sudha Ahuja,Xiaocong Ai,Giulio Aielli,Malak Ait Tamlihat,Brahim Aitbenchikh,Iakov Aizenberg,Melike Akbiyik,Torsten Akesson,Andrei Akimov,Daiya Akiyama,Nilima Nilesh Akolkar,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Pietro Albicocco,Sara Alderweireldt,Martin Aleksa,Igor Alexandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Wael Alkakhi,Corentin Allaire,Benedict Allbrooke,Cristian Andres Allendes Flores,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Manuel Alvarez Estevez,Adrian Alvarez Fernandez,Mariagrazia Alviggi,Mohamed Aly,Yara Do Amaral Coutinho,Alessandro Ambler,Christoph Amelung,Maximilian Amerl,Christoph Ames,Dante Amidei,Susana Patricia Amor dos Santos,Kieran Robert Amos,Viktor Ananiev,Christos Anastopoulos,Timothy Robert Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,Stylianos Angelidakis,Aaron Angerami,Alexey Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,Daniel Joseph Antrim,Fabio Anulli,Masato Aoki,Takumi Aoki,Javier Alberto Aparisi Pozo,Marco Aparo,Ludovica Aperio Bella,Christian Appelt,Nordin Aranzabal Barrio,Victor Araujo Ferraz,Chiara Arcangeletti,Ayana Tamu Arce,Eloisa Arena,Jean-Francois Arguin,Spyros Argyropoulos,Jan-Hendrik Arling,Aaron James Armbruster,Olivier Arnaez,Hannah Arnold,Zulit Paola Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Nedaa Alexandra Asbah,Jihad Assahsah,Ketevi Adikle Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Julian Atkinson,Naim Bora Atlay,Hicham Atmani,Prachi Atmasiddha,Kamil Augsten,Silvia Auricchio,Adrien Auriol,Volker Andreas Austrup,Giuseppe Avolio,Konstantinos Axiotis,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Alexander Bachiu,Karl Filip Backman,Anthony Badea,Paolo Bagnaia,Marzieh Bahmani,Adam Bailey,Virginia Bailey,John Baines,Christos Bakalis,Keith Baker,Evelin Bakos,Debottam Bakshi Gupta,Rahul Balasubramanian,Evgenii Baldin,Petr Balek,Eric Ballabene,Fabrice Balli
Published Date
2023/4/24
A search for associated production of a heavy boson with a top-quark or a top-antitop-quark pair, and decaying into a pair is presented. The search uses the data recorded by the ATLAS detector in collisions at TeV at the Large Hadron Collider during the years 2015-2018, corresponding to an integrated luminosity of 139 fb. Events containing exactly one electron or muon are selected. The two top quarks from the resonance decay are reconstructed using jets clustered with a large radius parameter of . The invariant mass spectrum of the two top quark candidates is used to search for a resonance signal in the range of 1.0 TeV to 3.2 TeV. The presence of a signal is examined using an approach with minimal model dependence followed by a model-dependent interpretation. No significant excess is observed over the background expectation. Upper limits on the production cross section times branching ratio at 95% confidence level are provided as a function of mass between 1.0 TeV and 3.0 TeV, based on a simplified production model. The observed (expected) limits range from 21 (14) fb to 119 (86) fb depending on the choice of model parameters.
Tools for estimating fake/non-prompt lepton backgrounds with the ATLAS detector at the LHC
Authors
Ivan Lopez Paz,Atlas Collaboration
Journal
Journal of Instrumentation
Published Date
2023/11/1
Measurements and searches performed with the ATLAS detector at the CERN LHC often involve signatures with one or more prompt leptons. Such analyses are subject to 'fake/non-prompt' lepton backgrounds, where either a hadron or a lepton from a hadron decay or an electron from a photon conversion satisfies the prompt-lepton selection criteria. These backgrounds often arise within a hadronic jet because of particle decays in the showering process, particle misidentification or particle interactions with the detector material. As it is challenging to model these processes with high accuracy in simulation, their estimation typically uses data-driven methods. Three methods for carrying out this estimation are described, along with their implementation in ATLAS and their performance.
Measurement of the c-jet mistagging efficiency in events using pp collision data at collected with the ATLAS detector
Authors
Georges Aad,B Abbott,DC Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,SH Abidi,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,SV Addepalli,Jahred Adelman,Aytul Adiguzel,S Adorni,Tim Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,J Agarwala,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,I Aizenberg,S Akatsuka,M Akbiyik,TPA Åkesson,AV Akimov,K Al Khoury,GL Alberghi,J Albert,P Albicocco,MJ Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,KR Amos,CS Amrouche,V Ananiev,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,C Arcangeletti,ATH Arce,E Arena,J-F Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,S Auricchio,VA Austrup,G Avner,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,A Bachiu,F Backman,A Badea,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian
Journal
The European Physical Journal C
Published Date
2022/1
A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using events, where one of the W bosons decays into an electron or muon and a neutrino and the other decays into a quark–antiquark pair. The measurement utilises the relatively large and known branching ratio, which allows a measurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at and corresponds to an integrated luminosity of 139 fb. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total …
Performance of the ATLAS Level-1 topological trigger in Run 2
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,NL Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,K Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,Chiara Arcangeletti,ATH Arce,J-F Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Sebastian Artz,Haruka Asada,Kanae Asai,Shoji Asai,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Prachi Arvind Atmasiddha,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,K Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas
Journal
The European Physical Journal C
Published Date
2022/1
During LHC Run 2 (2015–2018) the ATLAS Level-1 topological trigger allowed efficient data-taking by the ATLAS experiment at luminosities up to 2.110 cms, which exceeds the design value by a factor of two. The system was installed in 2016 and operated in 2017 and 2018. It uses Field Programmable Gate Array processors to select interesting events by placing kinematic and angular requirements on electromagnetic clusters, jets, -leptons, muons and the missing transverse energy. It allowed to significantly improve the background event rejection and signal event acceptance, in particular for Higgs and B-physics processes.
Emulating the impact of additional proton–proton interactions in the ATLAS simulation by presampling sets of inelastic Monte Carlo events
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,NL Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,K Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,Chiara Arcangeletti,ATH Arce,Jean-Francois Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli,WK Balunas,J Balz,E Banas,M Bandieramonte
Journal
Computing and Software for Big Science
Published Date
2022/12
The accurate simulation of additional interactions at the ATLAS experiment for the analysis of proton–proton collisions delivered by the Large Hadron Collider presents a significant challenge to the computing resources. During the LHC Run 2 (2015–2018), there were up to 70 inelastic interactions per bunch crossing, which need to be accounted for in Monte Carlo (MC) production. In this document, a new method to account for these additional interactions in the simulation chain is described. Instead of sampling the inelastic interactions and adding their energy deposits to a hard-scatter interaction one-by-one, the inelastic interactions are presampled, independent of the hard scatter, and stored as combined events. Consequently, for each hard-scatter interaction, only one such presampled event needs to be added as part of the simulation chain. For the Run 2 simulation chain, with an average of 35 interactions per …
Measurements of the Higgs boson inclusive and differential fiducial cross-sections in the diphoton decay channel with pp collisions at = 13 TeV with the ATLAS …
Authors
Georges Aad,Brad Abbott,Dale C Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,SV Addepalli,Jahred Adelman,Aytül Adiguzel,S Adorni,Tim Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,J Agarwala,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,I Aizenberg,S Akatsuka,M Akbiyik,TPA Åkesson,AV Akimov,K Al Khoury,GL Alberghi,J Albert,P Albicocco,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,KR Amos,CS Amrouche,V Ananiev,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,C Arcangeletti,ATH Arce,E Arena,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,S Auricchio,VA Austrup,G Avner,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,A Bachiu,F Backman,A Badea,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji
Journal
Journal of High Energy Physics
Published Date
2022/8
A measurement of inclusive and differential fiducial cross-sections for the production of the Higgs boson decaying into two photons is performed using 139 fb− 1 of proton-proton collision data recorded at= 13 TeV by the ATLAS experiment at the Large Hadron Collider. The inclusive cross-section times branching ratio, in a fiducial region closely matching the experimental selection, is measured to be 67±6 fb, which is in agreement with the state-of-the-art Standard Model prediction of 64±4 fb. Extrapolating this result to the full phase space and correcting for the branching ratio, the total cross-section for Higgs boson production is estimated to be 58±6 pb. In addition, the cross-sections in four fiducial regions sensitive to various Higgs boson production modes and differential cross-sections as a function of either one or two of several observables are measured. All the measurements are found to be in agreement …
Strong constraints on jet quenching in centrality-dependent +Pb collisions at 5.02 TeV from ATLAS
Authors
Atlas Collaboration
Journal
arXiv preprint arXiv:2206.01138
Published Date
2022/6/2
Jet quenching is the process of color-charged partons losing energy via interactions with quark-gluon plasma droplets created in heavy-ion collisions. The collective expansion of such droplets is well described by viscous hydrodynamics. Similar evidence of collectivity is consistently observed in smaller collision systems, including and +Pb collisions. In contrast, while jet quenching is observed in Pb+Pb collisions, no evidence has been found in these small systems to date, raising fundamental questions about the nature of the system created in these collisions. The ATLAS experiment at the Large Hadron Collider has measured the yield of charged hadrons correlated with reconstructed jets in 0.36 nb of +Pb and 3.6 pb of collisions at 5.02 TeV. The yields of charged hadrons with GeV near and opposite in azimuth to jets with or 60 GeV, and the ratios of these yields between +Pb and collisions, , are reported. The collision centrality of +Pb events is categorized by the energy deposited by forward neutrons from the struck nucleus. The values are consistent with unity within a few percent for hadrons with GeV at all centralities. These data provide new, strong constraints which preclude almost any parton energy loss in central +Pb collisions.
Search for the charged-lepton-flavor-violating decay in collisions at TeV with the ATLAS detector
Authors
Georges Aad,B Abbott,DC Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,SH Abidi,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,SV Addepalli,Jahred Adelman,Aytul Adiguzel,S Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Jinky Agarwala,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Iakov Aizenberg,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Pietro Albicocco,MJ Alconada Verzini,Sara Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,Dante Amidei,SP Amor Dos Santos,Simone Amoroso,Kieran Robert Amos,Cherifa Sabrina Amrouche,Viktor Ananiev,Christos Anastopoulos,Nansi Andari,T Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,Chiara Arcangeletti,ATH Arce,Eloisa Arena,Jean-Francois Arguin,Spyros Argyropoulos,Jan-Hendrik Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Nedaa Alexandra Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,K Assamagan,Robert Astalos,Ryan Justin Atkin,M Atkinson,Naim Bora Atlay,Hicham Atmani,PA Atmasiddha,Kamil Augsten,Silvia Auricchio,Volker Andreas Austrup,Gal Avner,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Alexander Bachiu,F Backman,Anthony Badea,Paolo Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian
Journal
Physical Review D
Published Date
2023/8/25
A search for the charged-lepton-flavor-violating process Z→ e μ is presented, using 139 fb− 1 of s= 13 TeV p p collision data collected by the ATLAS experiment at the LHC. An excess in the e μ invariant mass spectrum near the Z boson mass would be a striking signature of new physics. No excess is observed, and an upper limit B (Z→ e μ)< 2.62× 10− 7 is placed on the branching fraction at 95% confidence level, which is the most stringent limit to date.
Determination of the parton distribution functions of the proton from ATLAS measurements of differential W±and Z boson production in association with jets
Authors
Georges Aad,B Abbott,DC Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,SH Abidi,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,SV Addepalli,Jahred Adelman,Aytul Adiguzel,S Adorni,Tim Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,J Agarwala,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,I Aizenberg,M Akbiyik,TPA Åkesson,AV Akimov,K Al Khoury,GL Alberghi,J Albert,P Albicocco,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,KR Amos,CS Amrouche,V Ananiev,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,C Arcangeletti,ATH Arce,E Arena,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,S Auricchio,VA Austrup,G Avner,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,A Bachiu,F Backman,A Badea,P Bagnaia,M Bahmani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin
Journal
The European Physical Journal C
Published Date
2022/5/13
This paper presents an analysis at next-to-next-to-leading order in the theory of quantum chromodynamics for the determination of a new set of proton parton distribution functions using diverse measurements in pp collisions at , 8 and 13 TeV, performed by the ATLAS experiment at the Large Hadron Collider, together with deep inelastic scattering data from ep collisions at the HERA collider. The ATLAS data sets considered are differential cross-section measurements of inclusive and boson production, and Z boson production in association with jets, production, inclusive jet production and direct photon production. In the analysis, particular attention is paid to the correlation of systematic uncertainties within and between the various ATLAS data sets and to the impact of model, theoretical and parameterisation uncertainties. The resulting set of parton distribution functions is called ATLASpdf21.
Optimisation of large-radius jet reconstruction for the ATLAS detector in 13 TeV proton–proton collisions
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,J Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Prachi Arvind Atmasiddha,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin
Journal
The European Physical Journal C
Published Date
2021/4
Jet substructure has provided new opportunities for searches and measurements at the LHC, and has seen continuous development since the optimization of the large-radius jet definition used by ATLAS was performed during Run 1. A range of new inputs to jet reconstruction, pile-up mitigation techniques and jet grooming algorithms motivate an optimisation of large-radius jet reconstruction for ATLAS. In this paper, this optimisation procedure is presented, and the performance of a wide range of large-radius jet definitions is compared. The relative performance of these jet definitions is assessed using metrics such as their pileup stability, ability to identify hadronically decaying W bosons and top quarks with large transverse momenta. A new type of jet input object, called a ‘unified flow object’is introduced which combines calorimeter-and inner-detector-based signals in order to achieve optimal performance across a …
Erratum: Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector (vol 11, 005, 2020)
Authors
M Aaboud,S Alderweireldt,S Caron,L Colasurdo,V Fabiani,CA Gottardo,OB Igonkina,N Ilic,AC Konig,S Nektarijevic,CJM Nellist,L Pedraza Diaz,JFP Schouwenberg
Published Date
2021
JHEP04(2021)142 Page 1 JHEP04(2021)142 Published for SISSA by Springer Received: March 9, 2021 Accepted: March 11, 2021 Published: April 15, 2021 Erratum: Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector The ATLAS collaboration E-mail: atlas.publications@cern.ch Erratum to: JHEP11(2020)005 ArXiv ePrint: 2006.12946 The Lagrangian in eq. (2.1) of JHEP 11 (2020) 005 has an erroneous factor of 1 2 . The analysis code used for the results reported in the paper does not have this factor. The results remain unchanged. L = g2 Λ2 { ηLL (qLγµqL) ( lLγµlL ) + ηRR (qRγµqR) ( lRγµlR ) + ηLR (qLγµqL) ( lRγµlR ) + ηRL (qRγµqR) ( lLγµlL ) } , (2.1) Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) …
Measurements of sensor radiation damage in the ATLAS inner detector using leakage currents
Authors
Atlas Collaboration
Journal
arXiv preprint arXiv:2106.09287
Published Date
2021/6/17
Non-ionizing energy loss causes bulk damage to the silicon sensors of the ATLAS pixel and strip detectors. This damage has important implications for data-taking operations, charged-particle track reconstruction, detector simulations, and physics analysis. This paper presents simulations and measurements of the leakage current in the ATLAS pixel detector and semiconductor tracker as a function of location in the detector and time, using data collected in Run 1 (2010-2012) and Run 2 (2015-2018) of the Large Hadron Collider. The extracted fluence shows a much stronger |z|-dependence in the innermost layers than is seen in simulation. Furthermore, the overall fluence on the second innermost layer is significantly higher than in simulation, with better agreement in layers at higher radii. These measurements are important for validating the simulation models and can be used in part to justify safety factors for future detector designs and interventions.
Search for new phenomena with top quark pairs in final states with one lepton, jets, and missing transverse momentum in pp collisions at = 13 TeV with the …
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz
Journal
Journal of high energy physics
Published Date
2021/4
A search for new phenomena with top quark pairs in final states with one isolated electron or muon, multiple jets, and large missing transverse momentum is performed. Signal regions are designed to search for two-, three-, and four-body decays of the directly pair-produced supersymmetric partner of the top quark (stop). Additional signal regions are designed specifically to search for spin-0 mediators that are produced in association with a pair of top quarks and decay into a pair of dark-matter particles. The search is performed using the Large Hadron Collider proton-proton collision dataset at a centre-of-mass energy of= 13 TeV recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb− 1. No significant excess above the Standard Model background is observed, and limits at 95% confidence level are set in the stop-neutralino mass plane and as a function of the …
Measurement of hadronic event shapes in high-pT multijet final states at = 13 TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas
Journal
Journal of High Energy Physics
Published Date
2021/1
A measurement of event-shape variables in proton-proton collisions at large momentum transfer is presented using data collected at= 13 TeV with the ATLAS detector at the Large Hadron Collider. Six event-shape variables calculated using hadronic jets are studied in inclusive multijet events using data corresponding to an integrated luminosity of 139 fb− 1. Measurements are performed in bins of jet multiplicity and in different ranges of the scalar sum of the transverse momenta of the two leading jets, reaching scales beyond 2 TeV. These measurements are compared with predictions from Monte Carlo event generators containing leading-order or next-to-leading order matrix elements matched to parton showers simulated to leading-logarithm accuracy. At low jet multiplicities, shape discrepancies between the measurements and the Monte Carlo predictions are observed. At high jet multiplicities, the shapes are …
Search for new phenomena in events with an energetic jet and missing transverse momentum in collisions at with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli,WK Balunas,J Balz
Journal
Physical Review D
Published Date
2021/6/10
Results of a search for new physics in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton-proton collision data corresponding to an integrated luminosity of 139 fb− 1 at a center-of-mass energy of 13 TeV collected in the period 2015–2018 with the ATLAS detector at the Large Hadron Collider. Compared to previous publications, in addition to an increase of almost a factor of four in the data size, the analysis implements a number of improvements in the signal selection and the background determination leading to enhanced sensitivity. Events are required to have at least one jet with transverse momentum above 150 GeV and no reconstructed leptons (e, μ or τ) or photons. Several signal regions are considered with increasing requirements on the missing transverse momentum starting at 200 GeV. Overall agreement is observed between the number of …
Longitudinal Flow Decorrelations in Collisions at with the ATLAS Detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Sebastian Artz,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas
Journal
Physical review letters
Published Date
2021/3/24
The first measurement of longitudinal decorrelations of harmonic flow amplitudes v n for n= 2–4 in Xe+ Xe collisions at s N N= 5.44 TeV is obtained using 3 μ b− 1 of data with the ATLAS detector at the LHC. The decorrelation signal for v 3 and v 4 is found to be nearly independent of collision centrality and transverse momentum (p T) requirements on final-state particles, but for v 2 a strong centrality and p T dependence is seen. When compared with the results from Pb+ Pb collisions at s N N= 5.02 TeV, the longitudinal decorrelation signal in midcentral Xe+ Xe collisions is found to be larger for v 2, but smaller for v 3. Current hydrodynamic models reproduce the ratios of the v n measured in Xe+ Xe collisions to those in Pb+ Pb collisions but fail to describe the magnitudes and trends of the ratios of longitudinal flow decorrelations between Xe+ Xe and Pb+ Pb. The results on the system-size dependence provide new …
Differential cross-section measurements for the electroweak production of dijets in association with a Z boson in proton–proton collisions at ATLAS
Authors
Atlas Collaboration
Published Date
2021
Differential cross-section measurements are presented for the electroweak production of two jets in association with a Z boson. These measurements are sensitive to the vector-boson fusion production mechanism and provide a fundamental test of the gauge structure of the Standard Model. The analysis is performed using proton–proton collision data collected by ATLAS at
Measurement of the t t production cross section in pp collisions at = 13 TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale C Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,AC Abusleme Hoffman,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,S Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Jinky Agarwala,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,Sara Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,Dante Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Christos Anastopoulos,Nansi Andari,T Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,Victor Andrei,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,Chiara Arcangeletti,ATH Arce,Eloisa Arena,Jean-Francois Arguin,Spyros Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Nedaa Alexandra Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,K Assamagan,Robert Astalos,Ryan Justin Atkin,M Atkinson,Naim Bora Atlay,Hicham Atmani,PA Atmasiddha,Kamil Augsten,Silvia Auricchio,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,K Bachas,F Backman,Anthony Badea,Paolo Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Eric Ballabene,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas
Journal
Journal of High Energy Physics
Published Date
2021/11
A measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 139 fb− 1 is presented. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorised according to the number of jets and how likely these are to contain b-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross section is found to be fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four …
Search for trilepton resonances from chargino and neutralino pair production in collisions with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale C Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS Abouzeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,K Asai,S Asai,T Asawatavonvanich,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,H Bachacou,K Bachas,M Backes,F Backman,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,EM Baldin,P Balek,F Balli,WK Balunas,J Balz,E Banas,M Bandieramonte
Journal
Physical Review D
Published Date
2021/6/7
A search is performed for the electroweak pair production of charginos and associated production of a chargino and neutralino, each of which decays through an R-parity-violating coupling into a lepton and a W, Z, or Higgs boson. The trilepton invariant-mass spectrum is constructed from events with three or more leptons, targeting chargino decays that include an electron or muon and a leptonically decaying Z boson. The analyzed dataset corresponds to an integrated luminosity of 139 fb− 1 of proton-proton collision data produced by the Large Hadron Collider at a center-of-mass energy of s= 13 TeV and collected by the ATLAS experiment between 2015 and 2018. The data are found to be consistent with predictions from the Standard Model. The results are interpreted as limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model. Limits are also set on the …
Search for type-III seesaw heavy leptons in dilepton final states in pp collisions at with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale C Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,K Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek
Journal
The European Physical Journal C
Published Date
2021/3
A search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV, corresponding to of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on the final state with two light leptons (electrons or muons) of different flavour and charge combinations, with at least two jets and large missing transverse momentum. No significant excess over the Standard Model expectation is observed. The results are translated into exclusion limits on heavy-lepton masses, and the observed lower limit on the mass of the type-III seesaw heavy leptons is 790 GeV at 95% confidence level.
Measurements of top-quark pair single- and double-differential cross-sections in the all-hadronic channel in pp collisions at = 13 TeV using the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas
Journal
Journal of high energy physics
Published Date
2021/1
Differential cross-sections are measured for top-quark pair production in the all-hadronic decay mode, using proton-proton collision events collected by the ATLAS experiment in which all six decay jets are separately resolved. Absolute and normalised single-and double-differential cross-sections are measured at particle and parton level as a function of various kinematic variables. Emphasis is placed on well-measured observables in fully reconstructed final states, as well as on the study of correlations between the top-quark pair system and additional jet radiation identified in the event. The study is performed using data from proton-proton collisions at= 13 TeV collected by the ATLAS detector at CERN’s Large Hadron Collider in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb− 1. The rapidities of the individual top quarks and of the top-quark pair are well modelled by several independent …
Search for dark matter produced in association with a single top quark in TeV collisions with the ATLAS detector
Authors
ATLAS collaboration
Journal
arXiv preprint arXiv:2211.13138
Published Date
2022/11/23
This paper presents a search for dark matter, , using events with a single top quark and an energetic boson. The analysis is based on proton-proton collision data collected with the ATLAS experiment at 13 TeV during LHC Run 2 (2015-2018), corresponding to an integrated luminosity of 139 fb. The search considers final states with zero or one charged lepton (electron or muon), at least one -jet and large missing transverse momentum. In addition, a result from a previous search considering two-charged-lepton final states is included in the interpretation of the results. The data are found to be in good agreement with the Standard Model predictions and the results are interpreted in terms of 95% confidence-level exclusion limits in the context of a class of dark matter models involving an extended two-Higgs-doublet sector together with a pseudoscalar mediator particle. The search is particularly sensitive to on-shell production of the charged Higgs boson state, , arising from the two-Higgs-doublet mixing, and its semi-invisible decays via the mediator particle, : . Signal models with masses up to 1.5 TeV and masses up to 350 GeV are excluded assuming a tan value of 1. For masses of of 150 (250) GeV, tan values up to 2 are excluded for masses between 200 (400) GeV and 1.5 TeV. Signals with tan values between 20 and 30 are excluded for masses between 500 and 800 GeV.
Search for charged Higgs bosons decaying into a top quark and a bottom quark at = 13 TeV with the ATLAS detector
Authors
Albert M Sirunyan,Armen Tumasyan,Wolfgang Adam,Federico Ambrogi,Thomas Bergauer,Johannes Brandstetter,Marko Dragicevic,Janos Erö,A Escalante Del Valle,Martin Flechl,Rudolf Fruehwirth,Manfred Jeitler,Natascha Krammer,Ilse Krätschmer,Dietrich Liko,Thomas Madlener,Ivan Mikulec,Navid Rad,Jochen Schieck,Robert Schöfbeck,Markus Spanring,Daniel Spitzbart,Wolfgang Waltenberger,C-E Wulz,Mateusz Zarucki,Vladimir Drugakov,Vladimir Mossolov,J Suarez Gonzalez,Mohamed Rashad Darwish,Eddi A De Wolf,Davide Di Croce,Xavier Janssen,Aleksandra Lelek,Maxim Pieters,H Rejeb Sfar,Hans Van Haevermaet,Pierre Van Mechelen,Senne Van Putte,Nick Van Remortel,Freya Blekman,Emil Sørensen Bols,Simranjit Singh Chhibra,Jorgen D’Hondt,Jarne De Clercq,Denys Lontkovskyi,Steven Lowette,Ivan Marchesini,Seth Moortgat,Quentin Python,Kirill Skovpen,Stefaan Tavernier,Walter Van Doninck,Petra Van Mulders,Diego Beghin,Bugra Bilin,Hugues Brun,Barbara Clerbaux,Gilles De Lentdecker,Hugo Delannoy,Brian Dorney,Laurent Favart,Anastasia Grebenyuk,Amandeep Kaur Kalsi,Andrey Popov,Nicolas Postiau,Elizabeth Starling,Laurent Thomas,C Vander Velde,P Vanlaer,D Vannerom,T Cornelis,D Dobur,I Khvastunov,M Niedziela,C Roskas,M Tytgat,W Verbeke,B Vermassen,M Vit,O Bondu,G Bruno,C Caputo,P David,C Delaere,M Delcourt,A Giammanco,V Lemaitre,J Prisciandaro,A Saggio,M Vidal Marono,P Vischia,J Zobec,FL Alves,GA Alves,G Correia Silva,C Hensel,A Moraes,P Rebello Teles,E Belchior Batista Das Chagas,W Carvalho,J Chinellato,E Coelho,EM Da Costa,GG Da Silveira,D De Jesus Damiao,C De Oliveira Martins,S Fonseca De Souza,LM Huertas Guativa,H Malbouisson,J Martins,D Matos Figueiredo,M Medina Jaime,M Melo De Almeida,C Mora Herrera,L Mundim,H Nogima,WL Prado Da Silva,LJ Sanchez Rosas,A Santoro,A Sznajder,M Thiel,EJ Tonelli Manganote,F Torres Da Silva De Araujo,A Vilela Pereira,CA Bernardes,L Calligaris,TR Fernandez Perez Tomei,EM Gregores,DS Lemos,PG Mercadante,SF Novaes,Sandra S Padula,A Aleksandrov,G Antchev,R Hadjiiska,P Iaydjiev,M Misheva,M Rodozov,M Shopova,G Sultanov,M Bonchev,A Dimitrov,T Ivanov,L Litov,B Pavlov,P Petkov,W Fang,X Gao,L Yuan,M Ahmad
Journal
Journal of High Energy Physics
Published Date
2020/7
A search for charged Higgs bosons (H±) decaying into a top and a bottom quark in the all-jet final state is presented. The analysis uses LHC proton-proton collision data recorded with the CMS detector in 2016 at= 13 TeV, corresponding to an integrated luminosity of 35.9 fb− 1. No significant excess is observed above the expected background. Model-independent upper limits at 95% confidence level are set on the product of the H±production cross section and branching fraction in two scenarios. For production in association with a top quark, limits of 21.3 to 0.007 pb are obtained for H±masses in the range of 0.2 to 3 TeV. Combining this with a search in leptonic final states results in improved limits of 9.25 to 0.005 pb. The complementary s-channel production of an H±is investigated in the mass range of 0.8 to 3 TeV and the corresponding upper limits are 4.5 to 0.023 pb. These results are interpreted using …
Search for Higgs boson production in association with a high-energy photon via vector-boson fusion with decay into bottom quark pairs at = 13 TeV with the …
Authors
Georges Aad,Brad Abbott,Dale C Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli,WK Balunas,J Balz
Journal
Journal of high energy physics
Published Date
2021/3
A search is presented for the production of the Standard Model Higgs boson in association with a high-energy photon. With a focus on the vector-boson fusion process and the dominant Higgs boson decay into b-quark pairs, the search benefits from a large reduction of multijet background compared to more inclusive searches. Results are reported from the analysis of 132 fb− 1 of pp collision data at= 13 TeV collected with the ATLAS detector at the LHC. The measured Higgs boson signal yield in this final-state signature is 1. 3±1. 0 times the Standard Model prediction. The observed significance of the Higgs boson signal above the background is 1. 3 standard deviations, compared to an expected significance of 1. 0 standard deviations.
Operation and performance of the ATLAS semiconductor tracker in LHC Run 2
Authors
Atlas Collaboration
Journal
arXiv preprint arXiv:2109.02591
Published Date
2021/9/6
The semiconductor tracker (SCT) is one of the tracking systems for charged particles in the ATLAS detector. It consists of 4088 silicon strip sensor modules. During Run 2 (20152018) the Large Hadron Collider delivered an integrated luminosity of 156 fb to the ATLAS experiment at a centre-of-mass collision energy of 13 TeV. The instantaneous luminosity and pile-up conditions were far in excess of those assumed in the original design of the SCT detector. Due to improvements to the data acquisition system, the SCT operated stably throughout Run 2. It was available for 99.9% of the integrated luminosity and achieved a data-quality efficiency of 99.85%. Detailed studies have been made of the leakage current in SCT modules and the evolution of the full depletion voltage, which are used to study the impact of radiation damage to the modules.
Search for doubly and singly charged Higgs bosons decaying into vector bosons in multi-lepton final states with the ATLAS detector using proton-proton collisions at $$\sqrt …
Authors
Georges Aad,Brad Abbott,Dale C Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,C Arcangeletti,ATH Arce,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli,WK Balunas,J Balz,E Banas
Journal
Journal of High Energy Physics
Published Date
2021/6
A search for charged Higgs bosons decaying into W±W±or W±Z bosons is performed, involving experimental signatures with two leptons of the same charge, or three or four leptons with a variety of charge combinations, missing transverse momentum and jets. A data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider between 2015 and 2018 is used. The data correspond to a total integrated luminosity of 139 fb− 1. The search is guided by a type-II seesaw model that extends the scalar sector of the Standard Model with a scalar triplet, leading to a phenomenology that includes doubly and singly charged Higgs bosons. Two scenarios are explored, corresponding to the pair production of doubly charged H±±bosons, or the associated production of a doubly charged H±±boson and a singly charged H±boson. No significant deviations …
Measurement of light-by-light scattering and search for axion-like particles with 2.2 nb− 1 of Pb+ Pb data with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,FA Arduh,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,H Bachacou,K Bachas,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli
Journal
Journal of High Energy Physics
Published Date
2021/3
This paper describes a measurement of light-by-light scattering based on Pb+ Pb collision data recorded by the ATLAS experiment during Run 2 of the LHC. The study uses 2. 2 nb− 1 of integrated luminosity collected in 2015 and 2018 at= 5. 02 TeV. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy> 2. 5 GeV, pseudorapidity| η γ|< 2. 37, diphoton invariant mass m γγ> 5 GeV, and with small diphoton transverse momentum and diphoton acoplanarity. The integrated and differential fiducial cross sections are measured and compared with theoretical predictions. The diphoton invariant mass distribution is used to set limits on the production of axion-like particles. This result provides the most stringent limits to date on axion-like particle production for masses in the range 6–100 GeV. Cross sections above 2 to 70 nb are excluded at the …
Search for bottom-squark pair production in collision events at with hadronically decaying -leptons, -jets, and missing transverse momentum …
Authors
Georges Aad,Brad Abbott,Dale C Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli
Journal
Physical Review D
Published Date
2021/8/31
A search for pair production of bottom squarks in events with hadronically decaying τ-leptons, b-tagged jets, and large missing transverse momentum is presented. The analyzed dataset is based on proton-proton collisions at s= 13 TeV delivered by the Large Hadron Collider and recorded by the ATLAS detector from 2015 to 2018, and corresponds to an integrated luminosity of 139 fb− 1. The observed data are compatible with the expected Standard Model background. Results are interpreted in a simplified model where each bottom squark is assumed to decay into the second-lightest neutralino χ 2 0 and a bottom quark, with χ 2 0 decaying into a Higgs boson and the lightest neutralino χ 1 0. The search focuses on final states where at least one Higgs boson decays into a pair of hadronically decaying τ-leptons. This allows the acceptance and thus the sensitivity to be significantly improved relative to the previous …
Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at = 13 TeV with the ATLAS detector
Authors
Georges Aad,Braden Abbott,Dale C Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Ossama S AbouZeid,Nicola Louise Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,S Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,Sara Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,Dante Amidei,SP Amor Dos Santos,Simone Amoroso,Fenfen An,Christos Anastopoulos,T Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,Victor Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Jean-Francois Arguin,Spyros Argyropoulos,J-H Arling,Aaron James Armbruster,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Alexandra Asbah,Lily Asquith,Jihad Assahsah,K Assamagan,Robert Astalos,Ryan Justin Atkin,M Atkinson,Naim Bora Atlay,Hicham Atmani,PA Atmasiddha,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,K Bachas,F Backman,Paolo Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas,Marilena Bandieramonte,Anjishnu Bandyopadhyay,Sw Banerjee
Journal
Journal of high energy physics
Published Date
2021/6
A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton is presented. The search is based on a dataset of pp collisions at= 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb− 1. Events are selected if they have one light lepton (electron or muon) and at least one hadronically decaying τ-lepton, or at least two light leptons. In addition, two or more jets, at least one of which must be identified as containing b-hadrons, are required. Six final states, defined by the multiplicity and flavour of lepton candidates, are considered in the analysis. Each of them is split into multiple event categories to simultaneously search for the signal and constrain several leading backgrounds. The signal-rich event categories require at least one hadronically decaying τ-lepton candidate and exploit the …
Search for resonances decaying into photon pairs in 139 fb of collisions at 13 TeV with the ATLAS detector
Authors
ATLAS collaboration
Journal
arXiv preprint arXiv:2102.13405
Published Date
2021/2/26
Searches for new resonances in the diphoton final state, with spin 0 as predicted by theories with an extended Higgs sector and with spin 2 using a warped extra-dimension benchmark model, are presented using 139 fb of 13 TeV collision data collected by the ATLAS experiment at the LHC. No significant deviation from the Standard Model is observed and upper limits are placed on the production cross-section times branching ratio to two photons as a function of the resonance mass.
Exclusive dimuon production in ultraperipheral collisions at with ATLAS
Authors
Georges Aad,Brad Abbott,Dale C Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,J-F Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,NA Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,K Bachas,Filip Backman,Paolo Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli
Journal
Physical Review C
Published Date
2021/8/19
Exclusive dimuon production in ultraperipheral collisions (UPC), resulting from photon-photon interactions in the strong electromagnetic fields of colliding high-energy lead nuclei, PbPb (γ γ)→ μ+ μ−(Pb (★) Pb (★)), is studied using L int= 0.48 nb− 1 of s N N= 5.02 TeV lead-lead collision data at the LHC with the ATLAS detector. Dimuon pairs are measured in the fiducial region p T, μ> 4 GeV,| η μ|< 2.4, invariant mass m μ μ> 10 GeV, and p T, μ μ< 2 GeV. The primary background from single-dissociative processes is extracted from the data using a template fitting technique. Differential cross sections are presented as a function of m μ μ, absolute pair rapidity (| y μ μ|), scattering angle in the dimuon rest frame (| cos ϑ μ μ★|), and the colliding photon energies. The total cross section of the UPC γ γ→ μ+ μ− process in the fiducial volume is measured to be σ fid μ μ= 34.1±0.3 (stat.)±0.7 (syst.) μ b. Generally good …
Measurements of Higgs bosons decaying to bottom quarks from vector boson fusion production with the ATLAS experiment at
Authors
ATLAS Collaboration atlas. publications@ cern. ch,G Aad,Brad Abbott,DC Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli,WK Balunas,J Balz,E Banas
Journal
The European Physical Journal C
Published Date
2021/6
The paper presents a measurement of the Standard Model Higgs Boson decaying to b-quark pairs in the vector boson fusion (VBF) production mode. A sample corresponding to 126 of proton–proton collision data, collected with the ATLAS experiment at the Large Hadron Collider, is analyzed utilizing an adversarial neural network for event classification. The signal strength, defined as the ratio of the measured signal yield to that predicted by the Standard Model for VBF Higgs production, is measured to be , corresponding to an observed (expected) significance of 2.6 (2.8) standard deviations from the background only hypothesis. The results are additionally combined with an analysis of Higgs bosons decaying to b-quarks, produced via VBF in association with a photon.
Performance of the ATLAS RPC detector and Level-1 muon barrel trigger at TeV
Authors
Atlas Collaboration
Journal
arXiv preprint arXiv:2103.01029
Published Date
2021/2/25
The ATLAS experiment at the Large Hadron Collider (LHC) employs a trigger system consisting of a first-level hardware trigger (L1) and a software-based high-level trigger. The L1 muon trigger system selects muon candidates, assigns them to the correct LHC bunch crossing and classifies them into one of six transverse-momentum threshold classes. The L1 muon trigger system uses resistive-plate chambers (RPCs) to generate the muon-induced trigger signals in the central (barrel) region of the ATLAS detector. The ATLAS RPCs are arranged in six concentric layers and operate in a toroidal magnetic field with a bending power of 1.5 to 5.5 Tm. The RPC detector consists of about 3700 gas volumes with a total surface area of more than 4000 m. This paper reports on the performance of the RPC detector and L1 muon barrel trigger using 60.8 fb of proton-proton collision data recorded by the ATLAS experiment in 2018 at a centre-of-mass energy of 13 TeV. Detector and trigger performance are studied using boson decays into a muon pair. Measurements of the RPC detector response, efficiency, and time resolution are reported. Measurements of the L1 muon barrel trigger efficiencies and rates are presented, along with measurements of the properties of the selected sample of muon candidates. Measurements of the RPC currents, counting rates and mean avalanche charge are performed using zero-bias collisions. Finally, RPC detector response and efficiency are studied at different high voltage and front-end discriminator threshold settings in order to extrapolate detector response to the higher luminosity expected for the High Luminosity …
Measurement of single top-quark production in association with a W boson in the single-lepton channel at with the ATLAS detector
Authors
Georges Aad,Braden Abbott,Dale C Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,S Adachi,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,M Adersberger,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,D Alexandre,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,M Aliev,G Alimonti,J Alison,SP Alkire,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,A Alonso,F Alonso,C Alpigiani,AA Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,CF Anders,JK Anders,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,L Aperio Bella,G Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,FA Arduh,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,S Artz,S Asai,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,K Augsten,G Avolio,R Avramidou,MK Ayoub,AM Azoulay,G Azuelos,H Bachacou,K Bachas,M Backes,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,M Bajic,C Bakalis,OK Baker,PJ Bakker,D Bakshi Gupta,S Balaji,EM Baldin
Journal
The European Physical Journal C
Published Date
2021/8
The production cross-section of a top quark in association with a W boson is measured using proton–proton collisions at . The dataset corresponds to an integrated luminosity of , and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the tW signal from the dominant background. The cross-section is extracted from a binned profile maximum-likelihood fit to a two-dimensional discriminant built from the neural-network output and the invariant mass of the hadronically decaying W boson. The measured cross-section is , in good agreement with the Standard Model expectation.
Testing new physics models with global comparisons to collider measurements: the Contur toolkit
Authors
Andy Buckley,Jonathan Mark Butterworth,Louie Corpe,Martin Habedank,Danping Huang,David Yallup,M Altakach,G Bassman,Ishaan Lagwankar,Juan Rocamonde,H Saunders,B Waugh,G Zilgalvis
Journal
SciPost Physics Core
Published Date
2021/5/20
Measurements at particle collider experiments, even if primarily aimed at understanding Standard Model processes, can have a high degree of model independence, and implicitly contain information about potential contributions from physics beyond the Standard Model. The Contur package allows users to benefit from the hundreds of measurements preserved in the Rivet library to test new models against the bank of LHC measurements to date. This method has proven to be very effective in several recent publications from the Contur team, but ultimately, for this approach to be successful, the authors believe that the Contur tool needs to be accessible to the wider high energy physics community. As such, this manual accompanies the first user-facing version: Contur v2. It describes the design choices that have been made, as well as detailing pitfalls and common issues to avoid. The authors hope that with the help of this documentation, external groups will be able to run their own Contur studies, for example when proposing a new model, or pitching a new search.
Search for dark matter in association with an energetic photon in pp collisions at = 13 TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,NL Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Fabrice Balli
Journal
Journal of high energy physics
Published Date
2021/2
A search for dark matter is conducted in final states containing a photon and missing transverse momentum in proton-proton collisions at= 13 TeV. The data, collected during 2015–2018 by the ATLAS experiment at the CERN LHC, correspond to an integrated luminosity of 139 fb− 1. No deviations from the predictions of the Standard Model are observed and 95% confidence-level upper limits between 2.45 fb and 0.5 fb are set on the visible cross section for contributions from physics beyond the Standard Model, in different ranges of the missing transverse momentum. The results are interpreted as 95% confidence-level limits in models where weakly interacting dark-matter candidates are pair-produced via an s-channel axial-vector or vector mediator. Dark-matter candidates with masses up to 415 (580) GeV are excluded for axial-vector (vector) mediators, while the maximum excluded mass of the mediator is …
Measurement of the relative production cross section with the ATLAS detector at
Authors
Morad Aaboud,Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,DK Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,S Adachi,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,M Adersberger,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,F Ahmadov,G Aielli,S Akatsuka,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,D Alexandre,T Alexopoulos,A Alfonsi,M Alhroob,B Ali,G Alimonti,J Alison,SP Alkire,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,A Alonso,F Alonso,C Alpigiani,AA Alshehri,MI Alstaty,M Alvarez Estevez,B Alvarez Gonzalez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,CF Anders,JK Anders,A Andreazza,V Andrei,CR Anelli,S Angelidakis,I Angelozzi,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,L Aperio Bella,G Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,ATH Arce,FA Arduh,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,LJ Armitage,A Armstrong,O Arnaez,H Arnold,A Artamonov,G Artoni,S Artz,S Asai,NA Asbah,EM Asimakopoulou,L Asquith,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,K Augsten,G Avolio,R Avramidou,MK Ayoub,AM Azoulay,G Azuelos,AE Baas,MJ Baca,H Bachacou,K Bachas,M Backes,F Backman,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,M Bajic,C Bakalis,OK Baker,PJ Bakker,D Bakshi Gupta,S Balaji,EM Baldin,P Balek,F Balli,WK Balunas
Journal
Physical Review D
Published Date
2021/7/26
The total cross section and differential cross sections for the production of B c±mesons, times their branching fraction to J/ψ π±, are measured relative to those for the production of B±mesons, times their branching fraction to J/ψ K±. The data used for this study correspond to an integrated luminosity of 20.3 fb− 1 of p p collisions recorded by the ATLAS detector at the Large Hadron Collider in 2012 at a center-of-mass energy of s= 8 TeV. The measurement is performed differentially in bins of transverse momentum p T for 13 GeV< p T (B c±)< 22 GeV and p T (B c±)> 22 GeV and in bins of rapidity y for| y|< 0.75 and 0.75<| y|< 2.3. The relative cross section times branching fraction for the full range p T> 13 GeV and| y|< 2.3 is (0.34±0.0 4 stat− 0.02+ 0.06 sys±0.0 1 lifetime)%. The differential measurements suggest that the production cross section of the B c±decreases faster with p T than the production cross section of the …
Measurement of the associated production of a Higgs boson decaying into b-quarks with a vector boson at high transverse momentum in pp collisions at s= 13 TeV with the ATLAS …
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas
Journal
Physics Letters B
Published Date
2021/5/10
The associated production of a Higgs boson with a W or Z boson decaying into leptons and where the Higgs boson decays to a b b¯ pair is measured in the high vector-boson transverse momentum regime, above 250 GeV, with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 139 fb− 1, were collected in proton–proton collisions at the Large Hadron Collider between 2015 and 2018 at a centre-of-mass energy of s= 13 TeV. The measured signal strength, defined as the ratio of the measured signal yield to that predicted by the Standard Model, is 0.72− 0.36+ 0.39 corresponding to an observed (expected) significance of 2.1 (2.7) standard deviations. Cross-sections of associated production of a Higgs boson decaying into b quark pairs with a W or Z gauge boson, decaying into leptons, are measured in two exclusive vector boson transverse momentum regions, 250–400 GeV and …
Measurements of WH and ZH production in the decay channel in pp collisions at with the ATLAS detector
Authors
Atlas Collaboration,G Aad,B Abbott,DC Abbott,A Abed Abud,K Abeling,DK Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,M Adersberger,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,FA Arduh,J-F Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,K Asai,S Asai,T Asawatavonvanich,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,H Bachacou,K Bachas,M Backes,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,EM Baldin,P Balek,F Balli
Journal
The European Physical Journal C
Published Date
2021/2
Measurements of the Standard Model Higgs boson decaying into a pair and produced in association with a W or Z boson decaying into leptons, using proton–proton collision data collected between 2015 and 2018 by the ATLAS detector, are presented. The measurements use collisions produced by the Large Hadron Collider at a centre-of-mass energy of , corresponding to an integrated luminosity of . The production of a Higgs boson in association with a W or Z boson is established with observed (expected) significances of 4.0 (4.1) and 5.3 (5.1) standard deviations, respectively. Cross-sections of associated production of a Higgs boson decaying into bottom quark pairs with an electroweak gauge boson, W or Z, decaying into leptons are measured as a function of the gauge boson transverse momentum in kinematic fiducial volumes. The cross-section measurements are all consistent with …
Two-particle azimuthal correlations in photonuclear ultraperipheral collisions at 5.02 TeV with ATLAS
Authors
Georges Aad,Brad Abbott,Dale C Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,H Abreu,Y Abulaiti,AC Abusleme Hoffman,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,C Arcangeletti,ATH Arce,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli,WK Balunas,J Balz,E Banas,M Bandieramonte
Journal
Physical Review C
Published Date
2021/7/12
Two-particle long-range azimuthal correlations are measured in photonuclear collisions using 1.7 nb− 1 of 5.02 TeV Pb+ Pb collision data collected by the ATLAS experiment at the CERN Large Hadron Collider. Candidate events are selected using a dedicated high-multiplicity photonuclear event trigger, a combination of information from the zero-degree calorimeters and forward calorimeters, and from pseudorapidity gaps constructed using calorimeter energy clusters and charged-particle tracks. Distributions of event properties are compared between data and Monte Carlo simulations of photonuclear processes. Two-particle correlation functions are formed using charged-particle tracks in the selected events, and a template-fitting method is employed to subtract the nonflow contribution to the correlation. Significant nonzero values of the second-and third-order flow coefficients are observed and presented as a …
Observation of photon-induced W+ W− production in pp collisions at s= 13 TeV using the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,N Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Prachi Arvind Atmasiddha,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Fabrice Balli
Journal
Physics Letters B
Published Date
2021/5/10
This letter reports the observation of photon-induced production of W-boson pairs, γ γ→ W W. The analysis uses 139 fb− 1 of LHC proton–proton collision data taken at s= 13 TeV recorded by the ATLAS experiment during the years 2015–2018. The measurement is performed selecting one electron and one muon, corresponding to the decay of the diboson system as W W→ e±ν μ∓ ν final state. The background-only hypothesis is rejected with a significance of well above 5 standard deviations consistent with the expectation from Monte Carlo simulation. A cross section for the γ γ→ W W process of 3.13±0.31 (stat.)±0.28 (syst.) fb is measured in a fiducial volume close to the acceptance of the detector, by requiring an electron and a muon of opposite signs with large dilepton transverse momentum and exactly zero additional charged particles. This is found to be in agreement with the Standard Model prediction.
Search for new phenomena in final states with -jets and missing transverse momentum in TeV collisions with the ATLAS detector
Authors
Atlas Collaboration
Journal
arXiv preprint arXiv:2101.12527
Published Date
2021/1/29
The results of a search for new phenomena in final states with -jets and missing transverse momentum using 139 fb of proton-proton data collected at a centre-of-mass energy TeV by the ATLAS detector at the LHC are reported. The analysis targets final states produced by the decay of a pair-produced supersymmetric bottom squark into a bottom quark and a stable neutralino. The analysis also seeks evidence for models of pair production of dark matter particles produced through the decay of a generic scalar or pseudoscalar mediator state in association with a pair of bottom quarks, and models of pair production of scalar third-generation down-type leptoquarks. No significant excess of events over the Standard Model background expectation is observed in any of the signal regions considered by the analysis. Bottom squark masses below 1270 GeV are excluded at 95% confidence level if the neutralino is massless. In the case of nearly mass-degenerate bottom squarks and neutralinos, the use of dedicated secondary-vertex identification techniques permits the exclusion of bottom squarks with masses up to 660 GeV for mass splittings between the squark and the neutralino of 10 GeV. These limits extend substantially beyond the regions of parameter space excluded by similar ATLAS searches performed previously.
Search for supersymmetry in events with four or more charged leptons in 139 fb−1 of = 13 TeV pp collisions with the ATLAS detector
Authors
Georges Aad,Braden Abbott,Dale C Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nicola Louise Abraham,Halina Abramowicz,H Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,J Adelman,Aytul Adiguzel,S Adorni,T Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,T Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,A Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,NA Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,K Assamagan,Robert Astalos,Ryan Justin Atkin,M Atkinson,Naim Bora Atlay,Hicham Atmani,Prachi Arvind Atmasiddha,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,K Bachas,F Backman,Paolo Bagnaia,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas
Journal
Journal of High Energy Physics
Published Date
2021/7
A search for supersymmetry in events with four or more charged leptons (electrons, muons and τ-leptons) is presented. The analysis uses a data sample corresponding to 139 fb− 1 of proton-proton collisions delivered by the Large Hadron Collider at= 13 TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying τ-leptons are designed to target several supersymmetric models, while a general five-lepton signal region targets any new physics phenomena leading to a final state with five charged leptons. Data yields are consistent with Standard Model expectations and results are used to set upper limits on contributions from processes beyond the Standard Model. Exclusion limits are set at the 95% confidence level in simplified models of general gauge-mediated supersymmetry, excluding higgsino masses up to 540 GeV. In R-parity-violating simplified models with …
Search for heavy resonances decaying into a pair of Z bosons in the and final states using 139 of proton–proton collisions at TeV with …
Authors
Georges Aad,B Abbott,DC Abbott,A Abed Abud,K Abeling,DK Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,J Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli
Journal
The European Physical Journal C
Published Date
2021/4
A search for heavy resonances decaying into a pair of Z bosons leading to and final states, where stands for either an electron or a muon, is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV collected from 2015 to 2018 that corresponds to the integrated luminosity of 139 recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. Different mass ranges spanning 200 GeV to 2000 GeV for the hypothetical resonances are considered, depending on the final state and model. In the absence of a significant observed excess, the results are interpreted as upper limits on the production cross section of a spin-0 or spin-2 resonance. The upper limits for the spin-0 resonance are translated to exclusion contours in the context of Type-I and Type-II two-Higgs-doublet models, and the limits for the spin-2 resonance are used to constrain the …
The ATLAS fast TracKer system
Authors
Atlas Collaboration
Journal
arXiv preprint arXiv:2101.05078
Published Date
2021/1/12
The ATLAS Fast TracKer (FTK) was designed to provide full tracking for the ATLAS high-level trigger by using pattern recognition based on Associative Memory (AM) chips and fitting in high-speed field programmable gate arrays. The tracks found by the FTK are based on inputs from all modules of the pixel and silicon microstrip trackers. The as-built FTK system and components are described, as is the online software used to control them while running in the ATLAS data acquisition system. Also described is the simulation of the FTK hardware and the optimization of the AM pattern banks. An optimization for long-lived particles with large impact parameter values is included. A test of the FTK system with the data playback facility that allowed the FTK to be commissioned during the shutdown between Run 2 and Run 3 of the LHC is reported. The resulting tracks from part of the FTK system covering a limited - region of the detector are compared with the output from the FTK simulation. It is shown that FTK performance is in good agreement with the simulation.
Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector
Authors
Georges Aad,Braden Abbott,Dale C Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli
Journal
Journal of high energy physics
Published Date
2021/7
Measurements of four-lepton differential and integrated fiducial cross-sections in events with two same-flavour, opposite-charge electron or muon pairs are presented. The data correspond to 139 fb− 1 of= 13 TeV proton-proton collisions, collected by the ATLAS detector during Run 2 of the Large Hadron Collider (2015–2018). The final state has contributions from a number of interesting Standard Model processes that dominate in different four-lepton invariant mass regions, including single Z boson production, Higgs boson production and on-shell ZZ production, with a complex mix of interference terms, and possible contributions from physics beyond the Standard Model. The differential cross-sections include the four-lepton invariant mass inclusively, in slices of other kinematic variables, and in different lepton flavour categories. Also measured are dilepton invariant masses, transverse momenta, and angular …
Search for new phenomena in events with two opposite-charge leptons, jets and missing transverse momentum in pp collisions at = 13 TeV with the ATLAS …
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Prachi Arvind Atmasiddha,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Fabrice Balli
Journal
Journal of high energy physics
Published Date
2021/4
The results of a search for direct pair production of top squarks and for dark matter in events with two opposite-charge leptons (electrons or muons), jets and missing transverse momentum are reported, using 139 fb− 1 of integrated luminosity from proton-proton collisions at= 13 TeV, collected by the ATLAS detector at the Large Hadron Collider during Run 2 (2015–2018). This search considers the pair production of top squarks and is sensitive across a wide range of mass differences between the top squark and the lightest neutralino. Additionally, spin-0 mediator dark-matter models are considered, in which the mediator is produced in association with a pair of top quarks. The mediator subsequently decays to a pair of dark-matter particles. No significant excess of events is observed above the Standard Model background, and limits are set at 95% confidence level. The results exclude top squark masses up to …
Search for squarks and gluinos in final states with one isolated lepton, jets, and missing transverse momentum at TeV with the ATLAS detector
Authors
Atlas Collaboration
Journal
arXiv preprint arXiv:2101.01629
Published Date
2021/1/5
The results of a search for gluino and squark pair production with the pairs decaying via the lightest charginos into a final state consisting of two bosons, the lightest neutralinos (), and quarks, are presented. The signal is characterised by the presence of a single charged lepton ( or ) from a boson decay, jets, and missing transverse momentum. The analysis is performed using 139 fb of proton-proton collision data taken at a centre-of-mass energy TeV delivered by the Large Hadron Collider and recorded by the ATLAS experiment. No statistically significant excess of events above the Standard Model expectation is found. Limits are set on the direct production of squarks and gluinos in simplified models. Masses of gluino (squark) up to 2.2 TeV (1.4 TeV) are excluded at 95% confidence level for a light .
Search for charged-lepton-flavour violation in Z-boson decays with the ATLAS detector
Journal
Nature physics
Published Date
2021/7
Leptons with essentially the same properties apart from their mass are grouped into three families (or flavours). The number of leptons of each flavour is conserved in interactions, but this is not imposed by fundamental principles. Since the formulation of the standard model of particle physics, the observation of flavour oscillations among neutrinos has shown that lepton flavour is not conserved in neutrino weak interactions. So far, there has been no experimental evidence that this also occurs in interactions between charged leptons. Such an observation would be a sign of undiscovered particles or a yet unknown type of interaction. Here the ATLAS experiment at the Large Hadron Collider at CERN reports a constraint on lepton-flavour-violating effects in weak interactions, searching for Z-boson decays into a τ lepton and another lepton of different flavour with opposite electric charge. The branching fractions for these …
Measurement of the CP-violating phase in decays in ATLAS at 13 TeV
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Ovsat Abdinov,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,NL Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,K Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Didier Alexandre,Theodoros Alexopoulos,Alice Alfonsi,Muhammad Alhroob,Babar Ali,Gianluca Alimonti,John Alison,Steven Patrick Alkire,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,L Aperio Bella,Giorgi Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Lewis James Armitage,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,Andrei Artamonov,Giacomo Artoni,Sebastian Artz,Shoji Asai,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,R Avramidou,Mohamad Kassem Ayoub,Adam Maxwell Azoulay,Georges Azuelos,Matthew John Baca,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Milena Bajic,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek
Journal
The European Physical Journal C
Published Date
2021/4
A measurement of the decay parameters using of integrated luminosity collected with the ATLAS detector from 13 proton–proton collisions at the LHC is presented. The measured parameters include the CP-violating phase , the width difference between the meson mass eigenstates and the average decay width . The values measured for the physical parameters are combined with those from of 7 and 8 data, leading to the following: $$\begin{aligned} \phi _{s}= & {} -0.087 \pm 0.036 ~\mathrm {(stat.)} \pm 0.021 ~\mathrm {(syst.)~rad} \\ \Delta \Gamma _{s}= & {} 0.0657 \pm 0.0043 ~\mathrm {(stat.)}\pm 0.0037 ~\mathrm {(syst.)~ps}^{-1} \\ \Gamma _{s}= & {} 0.6703 \pm 0.0014 ~\mathrm {(stat.)}\pm 0.0018 ~\mathrm {(syst.)~ps}^{-1} \end{aligned}$$Results for and are also presented as 68% confidence level contours in the – plane. Furthermore the transversity …
Search for lepton-flavor-violation in -boson decays with -leptons with the ATLAS detector
Authors
G Aad,B Abbott,DC Abbott,A Abed Abud,K Abeling,DK Abhayasinghe,SH Abidi,OS Abouzeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,A Ahmad,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,M Akbiyik,TPA Akesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,T Alexopoulos,A Alfonsi,F Alfonsi,M Alhroob,B Ali,S Ali,M Aliev,G Alimonti,C Allaire,BMM Allbrooke,PP Allport,A Aloisio,F Alonso,C Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,C Anastopoulos,N Andari,T Andeen,JK Anders,SY Andrean,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,E Antipov,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal,V Araujo Ferraz,C Arcangeletti,ATH Arce,J-F Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,O Arnaez,H Arnold,ZP Arrubarrena Tame,G Artoni,H Asada,K Asai,S Asai,T Asawatavonvanich,NA Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,PA Atmasiddha,K Augsten,VA Austrup,G Avolio,MK Ayoub,G Azuelos,D Babal,H Bachacou,K Bachas,F Backman,P Bagnaia,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,C Bakalis,OK Baker,PJ Bakker,E Bakos,D Bakshi Gupta,S Balaji,R Balasubramanian,EM Baldin,P Balek,F Balli,WK Balunas,J Balz,E Banas,M Bandieramonte,A Bandyopadhyay,L Barak
Journal
NATURE PHYSICS
Published Date
2021
Leptons with essentially the same properties apart from their mass are grouped into three families (or flavours). The number of leptons of each flavour is conserved in interactions, but this is not imposed by fundamental principles. Since the formulation of the standard model of particle physics, the observation of flavour oscillations among neutrinos has shown that lepton flavour is not conserved in neutrino weak interactions. So far, there has been no experimental evidence that this also occurs in interactions between charged leptons. Such an observation would be a sign of undiscovered particles or a yet unknown type of interaction. Here the ATLAS experiment at the Large Hadron Collider at CERN reports a constraint on lepton-flavour-violating effects in weak interactions, searching for Z-boson decays into a τ lepton and another lepton of different flavour with opposite electric charge. The branching fractions for these decays are measured to be less than 8.1× 10− 6 (eτ) and 9.5× 10− 6 (μτ) at the 95% confidence level using 139 fb− 1 of proton–proton collision data at a centre-of-mass energy of s√= 13TeV and 20.3 fb− 1 at s√= 8TeV. These results supersede the limits from the Large Electron–Positron Collider experiments conducted more than two decades ago.
Search for top squarks in events with a Higgs or ℤ boson using 139 fb⁻ ¹ of pp collision data at\sqrts= 13 TeV with the ATLAS detector
Authors
Laura Franconi,Sigve Haug,John Kenneth Anders,Armin Ilg,Antonio Ereditato,Niklaus Lehmann,Antonio Miucci,Thomas Daniel Weston
Journal
European physical journal. C-particles and fields
Published Date
2020
This paper presents a search for direct top squark pair production in events with missing transverse momentum plus either a pair of jets consistent with Standard Model Higgs boson decay into b-quarks or a same-flavour opposite-sign dilepton pair with an invariant mass consistent with a Z boson. The analysis is performed using the proton–proton collision data at s√=13 TeV collected with the ATLAS detector during the LHC Run-2, corresponding to an integrated luminosity of 139 fb−1. No excess is observed in the data above the Standard Model predictions. The results are interpreted in simplified models featuring direct production of pairs of either the lighter top squark (t~1) or the heavier top squark (t~2), excluding at 95% confidence level t~1 and t~2 masses up to about 1220 and 875 GeV, respectively.
Search for new phenomena in final states with large jet multiplicities and missing transverse momentum using = 13 TeV proton-proton collisions recorded by …
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,NL Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal Barrio,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas
Journal
Journal of High Energy Physics
Published Date
2020/10
Results of a search for new particles decaying into eight or more jets and moderate missing transverse momentum are presented. The analysis uses 139 fb− 1 of proton-proton collision data at= 13 TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018. The selection rejects events containing isolated electrons or muons, and makes requirements according to the number of b-tagged jets and the scalar sum of masses of large-radius jets. The search extends previous analyses both in using a larger dataset and by employing improved jet and missing transverse momentum reconstruction methods which more cleanly separate signal from background processes. No evidence for physics beyond the Standard Model is found. The results are interpreted in the context of supersymmetry-inspired simplified models, significantly extending the limits on the gluino mass in those models …
Search for dijet resonances in events with an isolated charged lepton using TeV proton-proton collision data collected by the ATLAS detector
Authors
ATLAS collaboration
Journal
arXiv preprint arXiv:2002.11325
Published Date
2020/2/26
A search for dijet resonances in events with at least one isolated charged lepton is performed using of TeV proton-proton collision data recorded by the ATLAS detector at the LHC. The dijet invariant-mass () distribution constructed from events with at least one isolated electron or muon is searched in the region TeV for excesses above a smoothly falling background from Standard Model processes. Triggering based on the presence of a lepton in the event reduces limitations imposed by minimum transverse momentum thresholds for triggering on jets. This approach allows smaller dijet invariant masses to be probed than in inclusive dijet searches, targeting a variety of new-physics models, for example ones in which a new state is produced in association with a leptonically decaying or boson. No statistically significant deviation from the Standard Model background hypothesis is found. Limits on contributions from generic Gaussian signals with widths ranging from that determined by the detector resolution up to 15% of the resonance mass are obtained for dijet invariant masses ranging from 0.25 TeV to 6 TeV. Limits are set also in the context of several scenarios beyond the Standard Model, such as the Sequential Standard Model, a technicolor model, a charged Higgs boson model and a simplified Dark Matter model.
Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in = 13 TeV pp collisions with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal Barrio,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek
Journal
Journal of High Energy Physics
Published Date
2020/10
A search for new-physics resonances decaying into a lepton and a jet performed by the ATLAS experiment is presented. Scalar leptoquarks pair-produced in pp collisions at= 13 TeV at the Large Hadron Collider are considered using an integrated luminosity of 139 fb− 1, corresponding to the full Run 2 dataset. They are searched for in events with two electrons or two muons and two or more jets, including jets identified as arising from the fragmentation of c-or b-quarks. The observed yield in each channel is consistent with the Standard Model background expectation. Leptoquarks with masses below 1.8 TeV and 1.7 TeV are excluded in the electron and muon channels, respectively, assuming a branching ratio into a charged lepton and a quark of 100%, with minimal dependence on the quark flavour. Upper limits on the aforementioned branching ratio are also given as a function of the leptoquark mass.
Observation of the associated production of a top quark and a boson in collisions at TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Ossama Abouzeid,Nicola Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,Claire Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,Tony Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,Juan Antonio Aguilar Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Torsten Paul Ake Akesson,Ece Akilli,Andrei Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Maria Josefina Alconada Verzini,Sara Caroline Alderweireldt,Martin Aleksa,Igor Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,Benedict Allbrooke,Benjamin William Allen,Phillip Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,Manuel Alvarez Estevez,Mariagrazia Alviggi,Yara Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,Dante Eric Amidei,Susana Patricia Amor dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,George Victor Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,Alexey Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,Daniel Joseph Antrim,Fabio Anulli,Masato Aoki,Javier Alberto Aparisi Pozo,Ludovica Aperio Bella,Juan Pedro Araque Espinosa,Victor Araujo Ferraz,Rodrigo Araujo Pereira,Chiara Arcangeletti,Ayana Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,Jan-Hendrik Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,Zulit Paola Arrubarrena Tame,Giacomo Artoni,Sebastian Artz,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,Sina Baluch Bahrasemani,Adam Bailey,Virginia Ruth Bailey,John Baines,Christos Bakalis,Keith Baker,Pepijn Johannes Bakker,Debottam Bakshi Gupta,Shyam Balaji,Evgenii Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas,Anjishnu Bandyopadhyay,Swagato Banerjee,Arwa Bannoura
Published Date
2020/3/3
Single top-quark production in association with a Z boson, where the Z boson decays to a pair of charged leptons, is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment from 2015 to 2018 at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 139 fb− 1. Events containing three isolated charged leptons (electrons or muons) and two or three jets, one of which is identified as containing a b-hadron, are selected. The main backgrounds are from and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for tℓ+ ℓ− q production, including non-resonant dilepton pairs with> 30 GeV, is 97±13 (stat.)±7 (syst.) fb, consistent with the Standard Model prediction.
Measurements of inclusive and differential cross-sections of combined and production in the channel at 13 TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal Barrio,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek
Journal
Journal of High Energy Physics
Published Date
2020/9
Inclusive and differential cross-sections for the production of top quarks in association with a photon are measured with proton-proton collision data corresponding to an integrated luminosity of 139 fb− 1. The data were collected by the ATLAS detector at the LHC during Run 2 between 2015 and 2018 at a centre-of-mass energy of 13 TeV. The measurements are performed in a fiducial volume defined at parton level. Events with exactly one photon, one electron and one muon of opposite sign, and at least two jets, of which at least one is b-tagged, are selected. The fiducial cross-section is measured to be fb. Differential cross-sections as functions of several observables are compared with state-of-the-art Monte Carlo simulations and next-to-leading-order theoretical calculations. These include cross-sections as functions of photon kinematic variables, angular variables related to the photon and the leptons, and …
Measurement of the azimuthal anisotropy of charged-particle production in collisions at TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytül Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,L Aperio Bella,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,J-F Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Sebastian Artz,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,K Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas,Anjishnu Bandyopadhyay,Sw Banerjee,AAE Bannoura
Journal
Physical review C
Published Date
2020/2/10
This paper describes the measurements of flow harmonics v 2–v 6 in 3 μ b− 1 of Xe+ Xe collisions at s N N= 5.44 TeV performed using the ATLAS detector at the Large Hadron Collider (LHC). Measurements of the centrality, multiplicity, and p T dependence of the v n obtained using two-particle correlations and the scalar product technique are presented. The measurements are also performed using a template-fit procedure, which was developed to remove nonflow correlations in small collision systems. This nonflow removal is shown to have a significant influence on the measured v n at high p T, especially in peripheral events. Comparisons of the measured v n with measurements in Pb+ Pb collisions and p+ Pb collisions at s N N= 5.02 TeV are also presented. The v n values in Xe+ Xe collisions are observed to be larger than those in Pb+ Pb collisions for n= 2, 3, and 4 in the most central events. However, with …
Properties of Higgs Boson Interactions with Top Quarks in the and Processes Using with the ATLAS Detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal Barrio,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas
Journal
Physical review letters
Published Date
2020/8/5
A study of the charge conjugation and parity (C P) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H→ γ γ), and their production in association with a top quark pair (t t H) or single top quark (t H) is studied. The analysis uses 139 fb− 1 of proton–proton collision data recorded at a center-of-mass energy of s= 13 TeV with the ATLAS detector at the Large Hadron Collider. Assuming a C P-even coupling, the t t H process is observed with a significance of 5.2 standard deviations. The measured cross section times H→ γ γ branching ratio is 1.64− 0.36+ 0.38 (stat)− 0.14+ 0.17 (sys) fb, and the measured rate for t t H is 1.43− 0.31+ 0.33 (stat)− 0.15+ 0.21 (sys) times the Standard Model expectation. The t H production process is not observed and an upper limit on its rate of 12 times the Standard Model expectation is set. A C P …
Measurement of differential cross sections for single diffractive dissociation in = 8 TeV pp collisions using the ATLAS ALFA spectrometer
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,K Abeling,DK Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,S Adachi,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,M Adersberger,Aytül Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,D Alexandre,T Alexopoulos,A Alfonsi,M Alhroob,B Ali,G Alimonti,J Alison,SP Alkire,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,A Alonso,F Alonso,C Alpigiani,AA Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,CF Anders,JK Anders,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,L Aperio Bella,G Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,FA Arduh,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,A Artamonov,G Artoni,S Artz,S Asai,N Asbah,EM Asimakopoulou,L Asquith,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,K Augsten,G Avolio,R Avramidou,MK Ayoub,AM Azoulay,G Azuelos,MJ Baca,H Bachacou,K Bachas,M Backes,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,M Bajic,C Bakalis,OK Baker,PJ Bakker,D Bakshi Gupta,S Balaji,EM Baldin,P Balek,F Balli,WK Balunas
Journal
Journal of high energy physics
Published Date
2020/2
A dedicated sample of Large Hadron Collider proton-proton collision data at centre-of-mass energy= 8 TeV is used to study inclusive single diffractive dissociation, pp→ X p. The intact final-state proton is reconstructed in the ATLAS ALFA forward spectrometer, while charged particles from the dissociated system X are measured in the central detector components. The fiducial range of the measurement is− 4. 0< log 10 ξ<− 1. 6 and 0. 016<| t|< 0. 43 GeV 2, where ξ is the proton fractional energy loss and t is the squared four-momentum transfer. The total cross section integrated across the fiducial range is 1. 59±0. 13 mb. Cross sections are also measured differentially as functions of ξ, t, and∆ η, a variable that characterises the rapidity gap separating the proton and the system X. The data are consistent with an exponential t dependence, dσ/dt∝ e Bt with slope parameter B= 7. 65±0. 34 GeV− 2. Interpreted in the …
Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at = 8 TeV
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS Abou Zeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie AlKhoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Sebastian Artz,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz,Elzbieta Banas
Journal
Journal of high energy physics
Published Date
2020/8
The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb− 1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F 0), left-handed (F L), or right-handed (F R) polarizations. The resulting combined measurements of the polarization fractions are F 0= 0. 693±0. 014 and F L= 0. 315±0. 011. The fraction F R is calculated from the unitarity constraint to be F R=− 0. 008±0. 007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum …
Search for Heavy Resonances Decaying into a Photon and a Hadronically Decaying Higgs Boson in Collisions at with the ATLAS Detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Ossama Abouzeid,Nicola Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,Claire Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,Tony Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,Juan Antonio Aguilar Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,Torsten Paul Ake Akesson,Ece Akilli,Andrei Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Maria Josefina Alconada Verzini,Sara Caroline Alderweireldt,Martin Aleksa,Igor Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,Benedict Allbrooke,Benjamin William Allen,Phillip Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Elio Alunno Camelia,Manuel Alvarez Estevez,Mariagrazia Alviggi,Yara Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,Dante Eric Amidei,Susana Patricia Amor dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,George Victor Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,Alexey Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,Daniel Joseph Antrim,Fabio Anulli,Masato Aoki,Javier Alberto Aparisi Pozo,Marco Aparo,Ludovica Aperio Bella,Nordin Aranzabal Barrio,Victor Araujo Ferraz,Rodrigo Araujo Pereira,Chiara Arcangeletti,Ayana Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,Jan-Hendrik Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,Zulit Paola Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,Sina Baluch Bahrasemani,Adam Bailey,Virginia Ruth Bailey,John Baines,Christos Bakalis,Keith Baker,Pepijn Johannes Bakker,Evelin Bakos,Debottam Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,Evgenii Baldin,Petr Balek
Published Date
2020/9/8
This Letter presents a search for the production of new heavy resonances decaying into a Higgs boson and a photon using proton-proton collision data at sqrt[s]=13 TeV collected by the ATLAS detector at the LHC. The data correspond to an integrated luminosity of 139 fb^{-1}. The analysis is performed by reconstructing hadronically decaying Higgs boson (H→bb[over ¯]) candidates as single large-radius jets. A novel algorithm using information about the jet constituents in the center-of-mass frame of the jet is implemented to identify the two b quarks in the single jet. No significant excess of events is observed above the expected background. Upper limits are set on the production cross-section times branching fraction for narrow spin-1 resonances decaying into a Higgs boson and a photon in the resonance mass range from 0.7 to 4 TeV, cross-section times branching fractions are excluded between 11.6 fb and 0.11 fb at a 95% confidence level.
Search for the process via vector-boson fusion production using proton-proton collisions at TeV with the ATLAS detector
Authors
ATLAS collaboration
Journal
arXiv preprint arXiv:2001.05178
Published Date
2020/1/15
A search for Higgs boson pair production via vector-boson fusion (VBF) in the final state is carried out with the ATLAS experiment using 126 fb of proton-proton collision data delivered at TeV by the Large Hadron Collider. This search is sensitive to VBF production of additional heavy bosons that may decay into Higgs boson pairs, and in a non-resonant topology it can constrain the quartic coupling between the Higgs bosons and vector bosons. No significant excess relative to the Standard Model expectation is observed, and limits on the production cross-section are set at the 95 % confidence level for a heavy scalar resonance in the context of an extended Higgs sector, and for non-resonant Higgs boson pair production. Interpretation in terms of the coupling between a Higgs boson pair and two vector bosons is also provided: coupling values normalised to the Standard Model expectation of and are excluded at the 95 % confidence level in data.
arXiv : Reconstruction and identification of boosted di- systems in a search for Higgs boson pairs using 13 TeV protonproton collision data in ATLAS
Authors
Georges Aad,Alexander Kupco,Jay Chan,Timo Dreyer,Yufeng Wang,Karl Jakobs,Brian Le,Martin Spousta,Marina Cobal,Peilong Wang,Stefan Schmitt,Jaroslava Schovancova,Ahmed Bassalat,Matej Melo,Marjorie Shapiro,Grigore Tarna,Stephanie Zimmermann,Till Eifert,Sinan Kuday,Maximiliano Sioli,Holger Herr,Nello Bruscino,Joey Huston,Toshi Sumida,Steven Robertson,Ricardo Goncalo,Andrei Snesarev,Dirk Duschinger,James Oscar Thomas,Edson Carquin,Ying Wun Yvonne Ng,Sabine Crépé-Renaudin,John Parsons,William Keaton Balunas,Yury Tikhonov,Mohamad Kassem Ayoub,Javier Alberto Aparisi Pozo,Chilufya Mwewa,David Miller,Anna Ivina,Paolo Mastrandrea,Jan-Ulf Mjoernmark,William Axel Leight,Auke-Pieter Colijn,Liaoshan Shi,Michael Edward Nelson,Karel Cerny,Joseph M Muse,Jun Yan,Neil Warrack,Hans Krueger,Jose Ocariz,Markus Nordberg,Christian Weber,Daniela Bortoletto,Andrew Lankford,Stefan Tapprogge,Yi Fan Hu,Fabrizio Parodi,Tatsuya Masubuchi,Danilo Enoque Ferreira de Lima,Thomas LeCompte,Shenjian Chen,Souad Batlamous,Tim Martin,Joaquin Poveda,Chiara Roda,Tuan Nguyen Manh,Mohamed Ouchrif,Krzysztof Korcyl,Tatiana Lyubushkina,Christian Grefe,Paul Tipton,Felix Fidelio Klitzner,Alberto Valero,Tomoe Kishimoto,Kiyotomo Kawagoe,Henri Bachacou,Antonio Policicchio,Franziska Iltzsche Speiser,Stefano Zambito,Sergey Karpov,Pavol Strizenec,Christopher Lester,Sana Ketabchi Haghighat,José Enrique García Navarro,Shuzhou Zhang,Julian Fischer,Biagio Di Micco,Stefan Koperny,Leigh Schaefer,Claudia Bertella,Philippe Schwemling,Flera Rizatdinova,Evelin Meoni,Tova Ray Holmes,Izaac Gregory Sanderswood,Elena Michelle Villhauer,Zdenek Hubacek,Caterina Doglioni,Andrew Ferrante,Luigi Vigani,Abhishek Nag,Pawel Malecki,Stefan Raimund Maschek,Jan Stark,Elena Yatsenko,Paul Gessinger-Befurt,Masahiro Kuze,Benjamin Henry Hooberman,Sonia Carra,Katherine Pachal,Davide Costanzo,Michael James Fenton,Jesse Kar Kee Liu,Alexei Klimentov,Simone Pagan Griso,Todd Brian Huffman,Hongbin Liu,Thorsten Kuhl,Giuliano Gustavino,Mateusz Dyndal,Fenfen An,Mario Antonelli,Bogdan Malaescu,Ali Skaf,Deshan Kavishka Abhayasinghe,Kathryn Grimm,Daniele Zanzi,Sundeep Singh,Michael Glenn Eggleston,Virginia Ruth Bailey,Alexey Ezhilov,Stefio Yosse Andrean,Alain Bellerive,Jiri Masik,Alena Loesle,Lukas Adamek,Liron Barak,Dominique Godin,Giuseppe Iacobucci,Evgeny Shulga,Benedetto Gorini,Jesse Heilman,Dewen Zhong,John Butler,Harald Fox,Sergio Grancagnolo,Hok Chuen Cheng,Christopher Andrew Garner
Published Date
2020/7/29
In this paper, a new technique for reconstructing and identifying hadronically decaying τ+ τ− pairs with a large Lorentz boost, referred to as the di-τ tagger, is developed and used for the first time in the ATLAS experiment at the Large Hadron Collider. A benchmark di-τ tagging selection is employed in the search for resonant Higgs boson pair production, where one Higgs boson decays into a boosted b b pair and the other into a boosted τ+ τ− pair, with two hadronically decaying τ-leptons in the final state. Using 139 fb− 1 of proton-proton collision data recorded at a centre-of-mass energy of 13 TeV, the efficiency of the di-τ tagger is determined and the background with quark-or gluon-initiated jets misidentified as di-τ objects is estimated. The search for a heavy, narrow, scalar resonance produced via gluon-gluon fusion and decaying into two Higgs bosons is carried out in the mass range 1–3TeV using the same dataset. No deviations from the Standard Model predictions are observed, and 95% confidence-level exclusion limits are set on this model.
Search for resonances decaying into a weak vector boson and a Higgs boson in the fully hadronic final state produced in collisions at with …
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal Barrio,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek
Journal
Physical Review D
Published Date
2020/12/17
A search for heavy resonances decaying into a W or Z boson and a Higgs boson produced in proton− proton collisions at the Large Hadron Collider at s= 13 TeV is presented. The analysis utilizes the dominant W→ q q′ or Z→ q q and H→ b b decays with substructure techniques applied to large-radius jets. A sample corresponding to an integrated luminosity of 139 fb− 1 collected with the ATLAS detector is analyzed and no significant excess of data is observed over the background prediction. The results are interpreted in the context of the heavy vector triplet model with spin-1 W′ and Z′ bosons. Upper limits on the cross section are set for resonances with mass between 1.5 and 5.0 TeV, ranging from 6.8 to 0.53 fb for W′→ W H and from 8.7 to 0.53 fb for Z′→ Z H at the 95% confidence level.
Springer : Search for the process via vector-boson fusion production using proton-proton collisions at TeV with the ATLAS detector
Authors
Georges Aad,Alexander Kupco,Samuel Webb,Timo Dreyer,Yufeng Wang,Karl Jakobs,Brian Le,Martin Spousta,Marina Cobal,Peilong Wang,Stefan Schmitt,Jaroslava Schovancova,Ahmed Bassalat,Matej Melo,Marjorie Shapiro,Grigore Tarna,Stephanie Zimmermann,Till Eifert,Laura Rehnisch,Sinan Kuday,Federica Legger,Maximiliano Sioli,Holger Herr,Nello Bruscino,Filippo Maria Giorgi,Joey Huston,Toshi Sumida,Steven Robertson,Ricardo Goncalo,Andrei Snesarev,Laura La Rotonda,Dirk Duschinger,James Oscar Thomas,Edson Carquin,Ying Wun Yvonne Ng,Sabine Crépé-Renaudin,John Parsons,William Keaton Balunas,Yury Tikhonov,Mohamad Kassem Ayoub,Javier Alberto Aparisi Pozo,Chilufya Mwewa,David Miller,Anna Ivina,Paolo Mastrandrea,Jan-Ulf Mjoernmark,William Axel Leight,Auke-Pieter Colijn,Liaoshan Shi,Michael Edward Nelson,Karel Cerny,Neil Warrack,Hans Krueger,Jose Ocariz,Markus Nordberg,Christian Weber,Daniela Bortoletto,Andrew Lankford,Nikolai Sinev,Stefan Tapprogge,Yi Fan Hu,Fabrizio Parodi,Tatsuya Masubuchi,Danilo Enoque Ferreira de Lima,Thomas LeCompte,Shenjian Chen,Souad Batlamous,Tim Martin,Joaquin Poveda,Chiara Roda,Tuan Nguyen Manh,Mohamed Ouchrif,Krzysztof Korcyl,Tatiana Lyubushkina,Christian Grefe,Paul Tipton,Felix Fidelio Klitzner,Alberto Valero,Tomoe Kishimoto,Kiyotomo Kawagoe,Henri Bachacou,Antonio Policicchio,Franziska Iltzsche Speiser,Stefano Zambito,Sergey Karpov,Pavol Strizenec,Christopher Lester,David William Casper,Sana Ketabchi Haghighat,José Enrique García Navarro,Biagio Di Micco,Stefan Koperny,Leigh Schaefer,Claudia Bertella,Philippe Schwemling,Marcel Vos,Evelin Meoni,Tova Ray Holmes,Izaac Gregory Sanderswood,Zhi Zheng,Zdenek Hubacek,Caterina Doglioni,Andrew Ferrante,Luigi Vigani,Abhishek Nag,Alexey Boldyrev,Stefan Raimund Maschek,Jan Stark,Elena Yatsenko,Paul Gessinger-Befurt,Masahiro Kuze,Benjamin Henry Hooberman,Sonia Carra,Katherine Pachal,Davide Costanzo,Michael James Fenton,Jesse Kar Kee Liu,Alexei Klimentov,Simone Pagan Griso,Ilias Panagoulias,Todd Brian Huffman,Hongbin Liu,Thorsten Kuhl,Giuliano Gustavino,Mateusz Dyndal,Fenfen An,Mario Antonelli,Bogdan Malaescu,Deshan Kavishka Abhayasinghe,Kathryn Grimm,Daniele Zanzi,Michael Glenn Eggleston,Virginia Ruth Bailey,Alexey Ezhilov,David Paul Yallup,Alain Bellerive,Jiri Masik,Alena Loesle,Lukas Adamek,Liron Barak,Dominique Godin,Giuseppe Iacobucci,Evgeny Shulga,Benedetto Gorini,Jesse Heilman,Dewen Zhong,John Butler,Harald Fox,Sergio Grancagnolo,Hok Chuen Cheng
Journal
JHEP
Published Date
2020/1/14
The Higgs boson (????) was discovered by the ATLAS and CMS collaborations in 2012 [1, 2] using proton–proton (????????) collisions at the Large Hadron Collider (LHC). The measured properties have so far been found to be in agreement with the Standard Model (SM) predictions. The production of a pair of Higgs bosons (????????) is a rare process in the SM with a cross-section about 1000 times smaller than the single Higgs boson production cross-section, but various theories beyond the SM (BSM) predict cross-sections for ???????? production that are significantly higher than the SM prediction. Spin-0 resonances, with narrow or broad width, that decay into Higgs boson pairs, appear in BSM scenarios [3, 4]. Enhanced non-resonant Higgs boson pair production is predicted by many models, for example those featuring light coloured scalars [5] or new contact interactions, such as direct ???????????????? vertices [6, 7].Previous searches for Higgs boson pair production in the ???????????????? channel were carried out in the gluon–gluon fusion (ggF) production mode by the ATLAS and CMS collaborations [8–12], and limits were set for resonant and non-resonant production. Statistical combinations of search results for ???????? in various decay channels were also performed by the two experiments [13, 14], profiting from the sensitivity of several final states.
Measurements of the production cross-section for a Z boson in association with b-jets in proton-proton collisions at = 13 TeV with the ATLAS detector
Authors
Georges Aad,Erlend Aakvaag,Braden Keim Abbott,Sara Abdelhameed,Kira Abeling,Nils Julius Abicht,Haider Abidi,Mohammed Aboelela,Asmaa Aboulhorma,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Anke Ackermann,Claire Adam Bourdarios,Leszek Adamczyk,Sagar Addepalli,Matt Addison,Jahred Adelman,Aytul Adiguzel,Tim Adye,Tony Affolder,Yoav Afik,Merve Nazlim Agaras,Jinky Agarwala,Anamika Aggarwal,Catalin Agheorghiesei,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Sudha Ahuja,Xiaocong Ai,Giulio Aielli,Arya Aikot,Malak Ait Tamlihat,Brahim Aitbenchikh,Melike Akbiyik,Torsten Akesson,Andrei Akimov,Daiya Akiyama,Nilima Nilesh Akolkar,Sina Aktas,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Pietro Albicocco,Guillaume Lucas Albouy,Sara Alderweireldt,Zackary Lee Alegria,Martin Aleksa,Igor Alexandrov,Calin Alexa,Theodoros Alexopoulos,Fabrizio Alfonsi,Malte Algren,Muhammad Alhroob,Babar Ali,Hanadi Ali,Shahzad Ali,Samuel William Alibocus,Malik Aliev,Gianluca Alimonti,Wael Alkakhi,Corentin Allaire,Benedict Allbrooke,Julia Frances Allen,Cristian Andres Allendes Flores,Philip Patrick Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Zainab Mohammad K Alsolami,Manuel Alvarez Estevez,Adrian Alvarez Fernandez,Mario Alves Cardoso,Mariagrazia Alviggi,Mohamed Aly,Yara Do Amaral Coutinho,Alessandro Ambler,Christoph Amelung,Maximilian Amerl,Christoph Ames,Dante Amidei,Kyle Amirie,Susana Patricia Amor dos Santos,Kieran Robert Amos,Shiwen An,Viktor Ananiev,Christos Anastopoulos,Timothy Robert Andeen,Stefio Yosse Andrean,Attilio Andreazza,Stylianos Angelidakis,Aaron Angerami,Alexey Anisenkov,Alberto Annovi,Claire Antel,Egor Antipov,Mario Antonelli,Fabio Anulli,Masato Aoki,Takumi Aoki,Marco Aparo,Ludovica Aperio Bella,Christian Appelt,Aram Apyan,Sergio Javier Arbiol Val,Chiara Arcangeletti,Ayana Tamu Arce,Eloisa Arena,Jean-Francois Arguin,Spyros Argyropoulos,Jan-Hendrik Arling,Olivier Arnaez,Hannah Arnold,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Nedaa Alexandra Asbah,Ketevi Adikle Assamagan,Robert Astalos,Karl Sten Vilhelm Astrand,Rose Atashi,Ryan Justin Atkin,Markus Julian Atkinson,Hicham Atmani,Prachi Atmasiddha,Kamil Augsten,Silvia Auricchio,Adrien Auriol,Volker Andreas Austrup,Giuseppe Avolio,Konstantinos Axiotis,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Alexander Bachiu,Karl Filip Backman,Anthony Badea,Tamas Marton Baer,Paolo Bagnaia,Marzieh Bahmani,Daniel Bahner,Kehang Bai,John Baines,Luke Baines,Keith Baker,Evelin Bakos
Journal
Journal of high energy physics
Published Date
2024/3/26
This paper presents a measurement of the production cross-section of a boson in association with - or -jets, in proton-proton collisions at TeV with the ATLAS experiment at the Large Hadron Collider using data corresponding to an integrated luminosity of 140 fb. Inclusive and differential cross-sections are measured for events containing a boson decaying into electrons or muons and produced in association with at least one -jet, at least one -jet, or at least two -jets with transverse momentum GeV and rapidity . Predictions from several Monte Carlo generators based on next-to-leading-order matrix elements interfaced with a parton-shower simulation, with different choices of flavour schemes for initial-state partons, are compared with the measured cross-sections. The results are also compared with novel predictions, based on infrared and collinear safe jet flavour dressing algorithms. Selected -jet observables, optimized for sensitivity to intrinsic-charm, are compared with benchmark models with different intrinsic-charm fractions.
Search for a scalar partner of the top quark in the all-hadronic t (t) over-bar plus missing transverse momentum final state at root s= 13 TeV with the ATLAS detector
Authors
Laura Franconi,Sigve Haug,John Kenneth Anders,Armin Ilg,Antonio Ereditato,Niklaus Lehmann,Antonio Miucci,Thomas Daniel Weston
Journal
The European physical journal. C, Particles and fields
Published Date
2020
A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic tt¯ plus missing transverse momentum final state is presented. The analysis of 139 fb−1 of s√=13 TeV proton–proton collision data collected using the ATLAS detector at the LHC yields no significant excess over the Standard Model background expectation. To interpret the results, a supersymmetric model is used where the top squark decays via t~→t(∗)χ~01, with t(∗) denoting an on-shell (off-shell) top quark and χ~01 the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where mt~>mt+mχ~01, top squark masses are excluded in the range 400–1250 GeV for χ~01 masses below 200 GeV at 95% confidence level. In the situation where mt~∼mt+mχ~01, top squark masses in the range 300–630 GeV are excluded, while in the case where mt~<mW+mb+mχ~01 (with mt~−mχ~01≥5 GeV), considered for the first time in an ATLAS all-hadronic search, top squark masses in the range 300–660 GeV are excluded. Limits are also set for scalar third-generation up-type leptoquarks, excluding leptoquarks with masses below 1240 GeV when considering only leptoquark decays into a top quark and a neutrino.
Search for a heavy Higgs boson decaying into a boson and another heavy Higgs boson in the and final states in collisions at = 13 TeV with the …
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Ossama Abouzeid,Nicola Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,Claire Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,Sofia Adorni,Tim Adye,Tony Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,Juan Antonio Aguilar Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,Torsten Paul Ake Akesson,Ece Akilli,Andrei Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Maria Josefina Alconada Verzini,Sara Caroline Alderweireldt,Martin Aleksa,Igor Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,Benedict Allbrooke,Benjamin William Allen,Phillip Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Elio Alunno Camelia,Manuel Alvarez Estevez,Mariagrazia Alviggi,Yara Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,Dante Eric Amidei,Susana Patricia Amor dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,George Victor Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,Alexey Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,Daniel Joseph Antrim,Fabio Anulli,Masato Aoki,Javier Alberto Aparisi Pozo,Marco Aparo,Ludovica Aperio Bella,Nordin Aranzabal,Victor Araujo Ferraz,Rodrigo Araujo Pereira,Chiara Arcangeletti,Ayana Arce,Jean-Francois Arguin,Spyridon Argyropoulos,Jan-Hendrik Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,Zulit Paola Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Prachi Arvind Atmasiddha,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,Sina Baluch Bahrasemani,Adam Bailey,Virginia Ruth Bailey,John Baines,Christos Bakalis,Keith Baker,Pepijn Johannes Bakker,Evelin Bakos,Debottam Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,Evgenii Baldin,Petr Balek,Fabrice Balli
Published Date
2020/12/1
; Wosiek, B.; Wozniak, K.; Wraight, K.; Wu, SL; Wu, X.; Wu, Y.; Wuerzinger, J.; Wyatt, TR; Wynne, B.; Xella, S.; Xia, L.; Xiang, J.; Xiao, X.; Xie, X.; Xiotidis, I.; Xu, D.; Xu, H.; Xu, H.; Xu, L.; Xu, R.; Xu, T.; Xu, W.; Xu, Y.; Xu, Z.; Xu, Z.; Yabsley, B.
Measurement of the transverse momentum distribution of Drell–Yan lepton pairs in proton–proton collisions at√ s= 13 TeV with the ATLAS detector
Authors
Atlas Collaboration
Published Date
2020/7/1
∗ are produced via quark–antiquark annihilation [1], and can be observed with very small backgrounds by using their leptonic decay modes. The vector bosons have non-zero momentum transverse to the beam direction due to the emission of quarks and gluons from the initial-state partons as well as to the intrinsic transverse momentum of the initial-state partons in the proton. Phenomenologically, the spectrum at low transverse momentum of the ???? boson, ???? ℓℓ T, reconstructed through the decay into a pair of charged leptons, can be described using soft-gluon resummation [2–7] and non-perturbative models to account for the intrinsic transverse momentum of partons. At high ???? ℓℓ T the spectrum can be calculated by fixed-order perturbative quantum chromodynamics (QCD) predictions [8–12], and next-to-leading-order electroweak (NLO EW) effects are expected to be important [13–15]. Parton-shower models [16–18] or resummation may be matched to fixed-order calculations to describe the full spectrum.A precise measurement of the ???? ℓℓ T spectrum provides an important input to the background prediction in searches for beyond the Standard Model (SM) processes, eg in the monojet signature [19], as well as to SM precision measurements. In particular, the measurement of the mass of the ???? boson [20] relies on the measurement of the ???? ℓℓ T distribution to constrain the transverse momentum spectrum of the ???? boson, ???? ???? T, since a direct measurement of the transverse momentum distribution of ???? bosons is experimentally challenging [21]. The ???? ℓℓ T spectrum was measured previously in proton–proton (????????) collisions at the Large Hadron …
A search for the Z gamma decay mode of the Higgs boson in pp collisions at root s= 13 TeV with the ATLAS detector
Authors
M Aaboud,G Aad,B Abbott,DC Abbott,A Abed Abud,DK Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,S Adachi,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,M Adersberger,Aytül Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,F Ahmadov,X Ai,G Aielli,S Akatsuka,TPA Akesson,E Akilli,V Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,D Alexandre,T Alexopoulos,A Alfonsi,M Alhroob,B Ali,G Alimonti,J Alison,SP Alkire,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,A Alonso,F Alonso,C Alpigiani,AA Alshehri,I Alstaty,M Alvarez Estevez,B Alvarez Gonzalez,D Alvarez Piqueras,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,CF Anders,JK Anders,A Andreazza,V Andrei,CR Anelli,S Angelidakis,I Angelozzi,A Angerami,V Anisenkov,A Annovi,C Antel,MT Anthony,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,L Aperio Bella,G Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,ATH Arce,FA Arduh,JF Arguin,S Argyropoulos,JH Arling,AJ Armbruster,LJ Armitage,A Armstrong,O Arnaez,H Arnold,A Artamonov,G Artoni,S Artz,S Asai,N Asbah,EM Asimakopoulou,L Asquith,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,K Augsten,G Avolio,R Avramidou,MK Ayoub,AM Azoulay,G Azuelos,AE Baas,MJ Baca,H Bachacou,K Bachas,M Backes,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,M Bajic,C Bakalis,OK Baker,PJ Bakker,D Bakshi Gupta,S Balaji,EM Baldin,P Balek
Journal
Physics Letters B
Published Date
2020
A search for the Z gamma decay of the Higgs boson, with Z boson decays into pairs of electrons or muons is presented. The analysis uses proton-proton collision data at root s= 13 TeV corresponding to an integrated luminosity of 139 fb (-1) recorded by the ATLAS detector at the Large Hadron Collider. The observed data are consistent with the expected background with a p-value of 1.3%. An upper limit at 95% confidence level on the production cross-section times the branching ratio for pp-> H-> Z gamma is set at 3.6 times the Standard Model prediction while 2.6 times is expected in the presence of the Standard Model Higgs boson. The best-fit value for the signal yield normalised to the Standard Model prediction is 2.0 (-0.9)(+ 1.0) where the statistical component of the uncertainty is dominant.(C) 2020 The Author. Published by Elsevier BV (AU)
Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,NL Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal Barrio,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz
Journal
Journal of High Energy Physics
Published Date
2020/11
A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb− 1, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of= 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the …
Measurement of the Lund jet plane using charged particles in 13 TeV proton-proton collisions with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Malik Aliev,Gianluca Alimonti,Steven Patrick Alkire,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,L Aperio Bella,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Sebastian Artz,Shoji Asai,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,R Avramidou,Mohamad Kassem Ayoub,Adam Maxwell Azoulay,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Milena Bajic,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas
Journal
Physical review letters
Published Date
2020/6/4
The prevalence of hadronic jets at the LHC requires that a deep understanding of jet formation and structure is achieved in order to reach the highest levels of experimental and theoretical precision. There have been many measurements of jet substructure at the LHC and previous colliders, but the targeted observables mix physical effects from various origins. Based on a recent proposal to factorize physical effects, this Letter presents a double-differential cross-section measurement of the Lund jet plane using 139 fb− 1 of s= 13 TeV proton-proton collision data collected with the ATLAS detector using jets with transverse momentum above 675 GeV. The measurement uses charged particles to achieve a fine angular resolution and is corrected for acceptance and detector effects. Several parton shower Monte Carlo models are compared with the data. No single model is found to be in agreement with the measured …
Measurement of J/ψ production in association with a W±boson with pp data at 8 TeV
Authors
Morad Aaboud,Georges Aad,Brad Abbott,Dale Charles Abbott,B Abeloos,DK Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,S Adachi,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,M Adersberger,Aytül Adiguzel,T Adye,AA Affolder,Y Afik,C Agapopoulou,C Agheorghiesei,JA Aguilar-Saavedra,F Ahmadov,G Aielli,S Akatsuka,TPA Åkesson,E Akilli,AV Akimov,GL Alberghi,J Albert,P Albicocco,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,D Alexandre,T Alexopoulos,M Alhroob,B Ali,G Alimonti,J Alison,SP Alkire,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,A Alonso,F Alonso,C Alpigiani,AA Alshehri,MI Alstaty,B Alvarez Gonzalez,D Alvarez Piqueras,MG Alviggi,BT Amadio,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,CF Anders,JK Anders,A Andreazza,V Andrei,CR Anelli,S Angelidakis,I Angelozzi,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,L Aperio Bella,G Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,ATH Arce,FA Arduh,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,LJ Armitage,A Armstrong,O Arnaez,H Arnold,A Artamonov,G Artoni,S Artz,S Asai,N Asbah,EM Asimakopoulou,L Asquith,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,K Augsten,G Avolio,R Avramidou,MK Ayoub,AM Azoulay,G Azuelos,AE Baas,MJ Baca,H Bachacou,K Bachas,M Backes,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,M Bajic,C Bakalis,OK Baker,PJ Bakker,D Bakshi Gupta,S Balaji,EM Baldin,P Balek,F Balli,WK Balunas,J Balz,E Banas,A Bandyopadhyay,Sw Banerjee,AAE Bannoura
Journal
Journal of high energy physics
Published Date
2020/1
A measurement of the production of a prompt J/ψ meson in association with a W±boson with W±→ μν and J/ψ→ μ+ μ− is presented for J/ψ transverse momenta in the range 8. 5–150 GeV and rapidity| y J/ψ|< 2. 1 using ATLAS data recorded in 2012 at the LHC. The data were taken at a proton-proton centre-of-mass energy of= 8 TeV and correspond to an integrated luminosity of 20. 3 fb− 1. The ratio of the prompt J/ψ plus W±cross-section to the inclusive W±cross-section is presented as a differential measurement as a function of J/ψ transverse momenta and compared with theoretical predictions using different double-parton-scattering cross-sections.
Evidence for production in the multilepton final state in proton–proton collisions at with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,K Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Fabrice Balli
Journal
The European Physical Journal C
Published Date
2020/11
A search is presented for four-top-quark production using an integrated luminosity of 139 fb of proton–proton collision data at a centre-of-mass energy of collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.
Search for resonances in fully hadronic final states in collisions at TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Ossama Abouzeid,Nicola Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,Claire Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,Tony Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,Juan Antonio Aguilar Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Torsten Paul Ake Akesson,Ece Akilli,Andrei Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,Maria Josefina Alconada Verzini,Sara Caroline Alderweireldt,Martin Aleksa,Igor Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,Benedict Allbrooke,Benjamin William Allen,Phillip Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,Elio Alunno Camelia,Manuel Alvarez Estevez,Mariagrazia Alviggi,Yara Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,Dante Eric Amidei,Susana Patricia Amor dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,George Victor Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,Alexey Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,Daniel Joseph Antrim,Fabio Anulli,Masato Aoki,Javier Alberto Aparisi Pozo,Marco Aparo,Ludovica Aperio Bella,Nordin Aranzabal Barrio,Victor Araujo Ferraz,Rodrigo Araujo Pereira,Chiara Arcangeletti,Ayana Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,Jan-Hendrik Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,Zulit Paola Arrubarrena Tame,Giacomo Artoni,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,Sina Baluch Bahrasemani,Adam Bailey,Virginia Ruth Bailey,John Baines,Christos Bakalis,Keith Baker,Pepijn Johannes Bakker,Evelin Bakos,Debottam Bakshi Gupta,Shyam Balaji,Evgenii Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz
Published Date
2020/5/26
This paper presents a search for new heavy particles decaying into a pair of top quarks using 139 fb-1 of proton-proton collision data recorded at a centre-of-mass energy of
Search for Heavy Higgs Bosons Decaying into Two Tau Leptons with the ATLAS Detector Using pp Collisions at
Authors
Sigve Haug,Armin Ilg,Antonio Ereditato,Niklaus Lehmann,Antonio Miucci,Thomas Daniel Weston
Journal
Physical review letters
Published Date
2020
ATLAS detector. The search for heavy resonances is performed over the mass range 0.2–2.5 TeV for the τþτ− decay with at least one τ-lepton decaying into final states with hadrons. The data are in good agreement with the background prediction of the standard model. In the M125 h scenario of the minimal supersymmetric standard model, values of tanβ> 8 and tanβ> 21 are excluded at the 95% confidence level for neutral Higgs boson masses of 1.0 and 1.5 TeV, respectively, where tan β is the ratio of the vacuum expectation values of the two Higgs doublets.
Reconstruction and identification of boosted di-τ systems in a search for Higgs boson pairs using 13 TeV proton-proton collision data in ATLAS
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz
Journal
Journal of High Energy Physics
Published Date
2020/11
In this paper, a new technique for reconstructing and identifying hadronically decaying τ+ τ− pairs with a large Lorentz boost, referred to as the di-τ tagger, is developed and used for the first time in the ATLAS experiment at the Large Hadron Collider. A benchmark di-τ tagging selection is employed in the search for resonant Higgs boson pair production, where one Higgs boson decays into a boosted pair and the other into a boosted τ+ τ− pair, with two hadronically decaying τ-leptons in the final state. Using 139 fb− 1 of proton-proton collision data recorded at a centre-of-mass energy of 13 TeV, the efficiency of the di-τ tagger is determined and the background with quark-or gluon-initiated jets misidentified as di-τ objects is estimated. The search for a heavy, narrow, scalar resonance produced via gluon-gluon fusion and decaying into two Higgs bosons is carried out in the mass range 1–3 TeV using the same …
Search for light long-lived neutral particles produced in pp collisions at and decaying into collimated leptons or light hadrons with the ATLAS detector
Authors
ATLAS Collaboration atlas. publications@ cern. ch,G Aad,B Abbott,DC Abbott,A Abed Abud,K Abeling,DK Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,B Achkar,S Adachi,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,M Adersberger,A Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,F Ahmadov,WS Ahmed,X Ai,G Aielli,S Akatsuka,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,D Alexandre,T Alexopoulos,A Alfonsi,M Alhroob,B Ali,G Alimonti,J Alison,SP Alkire,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,A Alonso,F Alonso,C Alpigiani,AA Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,CF Anders,JK Anders,A Andreazza,V Andrei,CR Anelli,S Angelidakis,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,L Aperio Bella,G Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,C Arcangeletti,ATH Arce,FA Arduh,J -F Arguin,S Argyropoulos,J -H Arling,AJ Armbruster,A Armstrong,O Arnaez,H Arnold,A Artamonov,G Artoni,S Artz,S Asai,N Asbah,EM Asimakopoulou,L Asquith,J Assahsah,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,K Augsten,G Avolio,R Avramidou,MK Ayoub,AM Azoulay,G Azuelos,H Bachacou,K Bachas,M Backes,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,M Bajic,C Bakalis,OK Baker,PJ Bakker,D Bakshi Gupta,S Balaji,EM Baldin,P Balek,F Balli
Journal
The European Physical Journal C
Published Date
2020/5
Several models of physics beyond the Standard Model predict the existence of dark photons, light neutral particles decaying into collimated leptons or light hadrons. This paper presents a search for long-lived dark photons produced from the decay of a Higgs boson or a heavy scalar boson and decaying into displaced collimated Standard Model fermions. The search uses data corresponding to an integrated luminosity of 36.1 fb collected in proton–proton collisions at recorded in 2015–2016 with the ATLAS detector at the Large Hadron Collider. The observed number of events is consistent with the expected background, and limits on the production cross section times branching fraction as a function of the proper decay length of the dark photon are reported. A cross section times branching fraction above 4 pb is excluded for a Higgs boson decaying into two dark photons for dark-photon decay lengths …
Search for direct stau production in events with two hadronic τ-leptons in
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,NL Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Didier Alexandre,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Gianluca Alimonti,John Alison,Steven Patrick Alkire,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,L Aperio Bella,Giorgi Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Andrei Artamonov,Giacomo Artoni,Sebastian Artz,Shoji Asai,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,R Avramidou,Mohamad Kassem Ayoub,Adam Maxwell Azoulay,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Milena Bajic,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek
Journal
Physical Review D
Published Date
2020/2/28
A search for the direct production of the supersymmetric partners of τ-leptons (staus) in final states with two hadronically decaying τ-leptons is presented. The analysis uses a dataset of p p collisions corresponding to an integrated luminosity of 139 fb− 1, recorded with the ATLAS detector at the Large Hadron Collider at a center-of-mass energy of 13 TeV. No significant deviation from the expected Standard Model background is observed. Limits are derived in scenarios of direct production of stau pairs with each stau decaying into the stable lightest neutralino and one τ-lepton in simplified models where the two stau mass eigenstates are degenerate. Stau masses from 120 GeV to 390 GeV are excluded at 95% confidence level for a massless lightest neutralino.
Search for pair production of scalar leptoquarks decaying into first- or second-generation leptons and top quarks in proton-proton collisions at = 13 TeV with the …
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,Melike Akbiyik,TPA Åkesson,Ece Akilli,AV Akimov,K Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,Nordin Aranzabal,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Haruka Asada,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Prachi Arvind Atmasiddha,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Dominik Babal,Henri Bachacou,Konstantinos Bachas,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,Rahul Balasubramanian,EM Baldin,Petr Balek,Fabrice Balli
Journal
The European Physical Journal C
Published Date
2021/4
A search for pair production of scalar leptoquarks, each decaying into either an electron or a muon and a top quark, is presented. This is the first leptoquark search using ATLAS data to investigate top-philic cross-generational couplings that could provide explanations for recently observed anomalies in B meson decays. This analysis targets high leptoquark masses which cause the decay products of each resultant top quark to be contained within a single high- large-radius jet. The full Run 2 dataset is exploited, consisting of of data collected from proton–proton collisions at from 2015 to 2018 with the ATLAS detector at the CERN Large Hadron Collider. In the absence of any significant deviation from the background expectation, lower limits on the leptoquark masses are set at and for the electron and muon channel, respectively.
Search for chargino-neutralino production with mass splittings near the electroweak scale in three-lepton final states in collisions with the ATLAS …
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,NL Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Didier Alexandre,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Gianluca Alimonti,John Alison,Steven Patrick Alkire,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,L Aperio Bella,Giorgi Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,Andrei Artamonov,Giacomo Artoni,Sebastian Artz,Shoji Asai,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,R Avramidou,Mohamad Kassem Ayoub,Adam Maxwell Azoulay,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Milena Bajic,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli
Journal
Physical Review D
Published Date
2020/4/7
A search for supersymmetry through the pair production of electroweakinos with mass splittings near the electroweak scale and decaying via on-shell W and Z bosons is presented for a three-lepton final state. The analyzed proton-proton collision data taken at a center-of-mass energy of s= 13 TeV were collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb− 1. A search, emulating the recursive jigsaw reconstruction technique with easily reproducible laboratory-frame variables, is performed. The two excesses observed in the 2015–2016 data recursive jigsaw analysis in the low-mass three-lepton phase space are reproduced. Results with the full data set are in agreement with the Standard Model expectations. They are interpreted to set exclusion limits at the 95% confidence level on simplified models of chargino-neutralino pair …
Evidence for electroweak production of two jets in association with a ℤγ pair in pp collisions at\sqrts= 13 TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Malik Aliev,Gianluca Alimonti,Steven Patrick Alkire,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,M Alvarez Estevez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,L Aperio Bella,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Sebastian Artz,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,R Avramidou,Mohamad Kassem Ayoub,Adam Maxwell Azoulay,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Milena Bajic,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli
Journal
Physics Letters B
Published Date
2020/4/10
Evidence for electroweak production of two jets in association with a Zγ pair in s= 13 TeV proton–proton collisions at the Large Hadron Collider is presented. The analysis uses data collected by the ATLAS detector in 2015 and 2016 that corresponds to an integrated luminosity of 36.1 fb− 1. Events that contain a Z boson candidate decaying leptonically into either e+ e− or μ+ μ−, a photon, and two jets are selected. The electroweak component is measured with observed and expected significances of 4.1 standard deviations. The fiducial cross-section for electroweak production is measured to be σ Z γ j j− EW= 7.8±2.0 fb, in good agreement with the Standard Model prediction.
Springer: Search for heavy resonances decaying into a pair of Z bosons in the $\ell^+\ell^-\ell'^+\ell'^-$ and $\ell^+\ell^-\nu {{\bar {\nu}}} $ final states using 139$\mathrm …
Authors
Georges Aad,Alexander Kupco,Jay Chan,Pierre Antoine Delsart,Timo Dreyer,Yufeng Wang,Karl Jakobs,Brian Le,Martin Spousta,Savanna Shaw,Christian Ohm,Marina Cobal,Gen Tateno,Stefan Schmitt,Jaroslava Schovancova,Ahmed Bassalat,Matej Melo,Marjorie Shapiro,Grigore Tarna,Ketevi Adikle Assamagan,Till Eifert,Emma Grace Castiglia,Sinan Kuday,Maximiliano Sioli,Xiao Yang,Alessandro Caltabiano,Maximilian Emanuel Goblirsch-Kolb,Nello Bruscino,Rahul Balasubramanian,Sarah Marie Demers Konezny,Fernando Monticelli,Andrei Snesarev,Wasikul Islam,Ying Wun Yvonne Ng,Osamu Jinnouchi,William Keaton Balunas,Yury Tikhonov,Thomas Michael Carter,Javier Alberto Aparisi Pozo,David Miller,Anna Ivina,Paolo Mastrandrea,Jan-Ulf Mjoernmark,Barbara Krystyna Wosiek,William Axel Leight,Auke-Pieter Colijn,Liaoshan Shi,Sergio Diez Cornell,Michael Edward Nelson,Karel Cerny,Tristan Andrew Ruggeri,Jun Yan,Hans Krueger,Bruce Donald Yabsley,Christian Weber,Alex Christopher Martyniuk,Daniela Bortoletto,Stefan Tapprogge,Yi Fan Hu,Fabrizio Parodi,Tatsuya Masubuchi,Peilong Wang,Thomas LeCompte,Shenjian Chen,Juan Terron Cuadrado,Souad Batlamous,Tim Martin,Nicolo Magini,Chiara Roda,Thi Ngoc Loan Truong,Tuan Nguyen Manh,Mohamed Ouchrif,Ben Whitmore,Tatiana Lyubushkina,Christian Grefe,Mendes Jacques Da Costa,Antonio Manuel,Marcus Matthias Morgenstern,Felix Fidelio Klitzner,Laurynas Mince,Tomoe Kishimoto,Kiyotomo Kawagoe,Al Goshaw,Adam Edward Barton,Joni Pham,Lawrence Lee Jr,Zhijun Liang,Stefano Zambito,Sergey Karpov,Pavol Strizenec,Wainer Vandelli,Christopher Lester,Shuzhou Zhang,Julian Fischer,Biagio Di Micco,Andy Salnikov,Jonas Strandberg,Julie Kirk,Philippe Schwemling,Flera Rizatdinova,Evelin Meoni,Albert Kong,Julian Wollrath,Elena Michelle Villhauer,Zdenek Hubacek,Nanni Darbo,Caterina Doglioni,Etienne Marie Fortin,George Iakovidis,Abhishek Nag,Pawel Malecki,Stefan Raimund Maschek,Jan Stark,Paul Gessinger-Befurt,Masahiro Kuze,Benjamin Henry Hooberman,Sonia Carra,Davide Costanzo,Michael James Fenton,Meghranjana Chatterjee,Yasuhiro Makida,James William Howarth,Todd Brian Huffman,Geoffrey Norman Taylor,Alexander Undrus,Thorsten Kuhl,Giuliano Gustavino,Mateusz Dyndal,Fenfen An,Mario Antonelli,Bogdan Malaescu,Ali Skaf,Pedro Teixeira-Dias,Haider Abidi,Deshan Kavishka Abhayasinghe,Kathryn Grimm,Daniele Zanzi,Sundeep Singh,Ian Brock,Sayaka Wada,Christopher Robyn Hayes,Serguei Kuleshov,Mike Strauss,Alexey Ezhilov,Alexander Lory,Stefio Yosse Andrean,Alain Bellerive,Jiri Masik,Alena Loesle,Lukas Adamek
Journal
Eur. Phys. J. C
Published Date
2020/10/1
A search for heavy resonances decaying into a pair of Z bosons leading to l+l− l+ l− and l+l− νν final states, where l stands for either an electron or a muon, is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV collected from 2015 to 2018 that corresponds to the integrated luminosity of 139 fb− 1 recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. Different mass ranges spanning 200 GeV to 2000 GeV for the hypothetical resonances are considered, depending on the final state and model. In the absence of a significant observed excess, the results are interpreted as upper limits on the production cross section of a spin-0 or spin-2 resonance. The upper limits for the spin-0 resonance are translated to exclusion contours in the context of Type-I and Type-II two-Higgs-doublet models, and the limits for the spin-2 resonance are used to constrain the Randall–Sundrum model with an extra dimension giving rise to spin-2 graviton excitations.
Measurement of isolated-photon plus two-jet production in pp collisions at = 13 TeV with the ATLAS detector
Authors
Georges Aad,Alexander Kupco,Samuel Webb,Timo Dreyer,Yufeng Wang,Karl Jakobs,Brian Le,Martin Spousta,Marina Cobal,Peilong Wang,Stefan Schmitt,Jaroslava Schovancova,Ahmed Bassalat,Matej Melo,Marjorie Shapiro,Grigore Tarna,Stephanie Zimmermann,Till Eifert,Laura Rehnisch,Sinan Kuday,Federica Legger,Maximiliano Sioli,Lucio Cerrito,Nello Bruscino,Filippo Maria Giorgi,Joey Huston,Toshi Sumida,Steven Robertson,Ricardo Goncalo,Andrei Snesarev,Laura La Rotonda,Dirk Duschinger,James Oscar Thomas,Edson Carquin,Ying Wun Yvonne Ng,Sabine Crépé-Renaudin,John Parsons,William Keaton Balunas,Yury Tikhonov,Mohamad Kassem Ayoub,Javier Alberto Aparisi Pozo,Chilufya Mwewa,David Miller,Anna Ivina,Paolo Mastrandrea,Jan-Ulf Mjoernmark,William Axel Leight,Auke-Pieter Colijn,Liaoshan Shi,Michael Edward Nelson,Karel Cerny,Neil Warrack,Hans Krueger,Jose Ocariz,Markus Nordberg,Christian Weber,Daniela Bortoletto,Andrew Lankford,Nikolai Sinev,Stefan Tapprogge,Yi Fan Hu,Fabrizio Parodi,Tatsuya Masubuchi,Danilo Enoque Ferreira de Lima,Thomas LeCompte,Shenjian Chen,Souad Batlamous,Tim Martin,Joaquin Poveda,Chiara Roda,Tuan Nguyen Manh,Mohamed Ouchrif,Krzysztof Korcyl,Tatiana Lyubushkina,Christian Grefe,Paul Tipton,Felix Fidelio Klitzner,Alberto Valero,Tomoe Kishimoto,Kiyotomo Kawagoe,Henri Bachacou,Antonio Policicchio,Franziska Iltzsche Speiser,Stefano Zambito,Sergey Karpov,Pavol Strizenec,Christopher Lester,David William Casper,Sana Ketabchi Haghighat,José Enrique García Navarro,Biagio Di Micco,Stefan Koperny,Leigh Schaefer,Claudia Bertella,Philippe Schwemling,Marcel Vos,Evelin Meoni,Tova Ray Holmes,Izaac Gregory Sanderswood,Zhi Zheng,Zdenek Hubacek,Caterina Doglioni,Andrew Ferrante,Luigi Vigani,Abhishek Nag,Alexey Boldyrev,Stefan Raimund Maschek,Jan Stark,Elena Yatsenko,Paul Gessinger-Befurt,Masahiro Kuze,Benjamin Henry Hooberman,Sonia Carra,Katherine Pachal,Davide Costanzo,Michael James Fenton,Jesse Kar Kee Liu,Alexei Klimentov,Simone Pagan Griso,Ilias Panagoulias,Todd Brian Huffman,Hongbin Liu,Thorsten Kuhl,Giuliano Gustavino,Mateusz Dyndal,Fenfen An,Mario Antonelli,Bogdan Malaescu,Deshan Kavishka Abhayasinghe,Kathryn Grimm,Daniele Zanzi,Michael Glenn Eggleston,Virginia Ruth Bailey,Alexey Ezhilov,David Paul Yallup,Alain Bellerive,Jiri Masik,Alena Loesle,Lukas Adamek,Liron Barak,Dominique Godin,Giuseppe Iacobucci,Evgeny Shulga,Benedetto Gorini,Jesse Heilman,Dewen Zhong,John Butler,Harald Fox,Sergio Grancagnolo,Hok Chuen Cheng
Published Date
2019/12/20
The dynamics of isolated-photon plus two-jet production in pp collisions at a centre-of-mass energy of 13 TeV are studied with the ATLAS detector at the LHC using a dataset corresponding to an integrated luminosity of 36. 1 fb− 1. Cross sections are measured as functions of a variety of observables, including angular correlations and invariant masses of the objects in the final state, γ+ jet+ jet. Measurements are also performed in phase-space regions enriched in each of the two underlying physical mechanisms, namely direct and fragmentation processes. The measurements cover the range of photon (jet) transverse momenta from 150 GeV (100 GeV) to 2 TeV. The tree-level plus parton-shower predictions from S herpa and P ythia as well as the next-to-leading-order QCD predictions from S herpa are compared with the measurements. The next-to-leading-order QCD predictions describe the data adequately in …
Fluctuations of anisotropic flow in Pb+Pb collisions at = 5.02 TeV with the ATLAS detector
Authors
Morad Aaboud,Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,DK Abhayasinghe,SH Abidi,OS AbouZeid,NL Abraham,H Abramowicz,H Abreu,Y Abulaiti,BS Acharya,S Adachi,L Adam,C Adam Bourdarios,L Adamczyk,L Adamek,J Adelman,M Adersberger,Aytül Adiguzel,S Adorni,T Adye,AA Affolder,Y Afik,C Agapopoulou,MN Agaras,A Aggarwal,C Agheorghiesei,JA Aguilar-Saavedra,F Ahmadov,X Ai,G Aielli,S Akatsuka,TPA Åkesson,E Akilli,AV Akimov,K Al Khoury,GL Alberghi,J Albert,MJ Alconada Verzini,S Alderweireldt,M Aleksa,IN Aleksandrov,C Alexa,D Alexandre,T Alexopoulos,A Alfonsi,M Alhroob,B Ali,G Alimonti,J Alison,SP Alkire,C Allaire,BMM Allbrooke,BW Allen,PP Allport,A Aloisio,A Alonso,F Alonso,C Alpigiani,AA Alshehri,MI Alstaty,M Alvarez Estevez,B Alvarez Gonzalez,D Álvarez Piqueras,MG Alviggi,Y Amaral Coutinho,A Ambler,L Ambroz,C Amelung,D Amidei,SP Amor Dos Santos,S Amoroso,CS Amrouche,F An,C Anastopoulos,N Andari,T Andeen,CF Anders,JK Anders,A Andreazza,V Andrei,CR Anelli,S Angelidakis,I Angelozzi,A Angerami,AV Anisenkov,A Annovi,C Antel,MT Anthony,M Antonelli,DJA Antrim,F Anulli,M Aoki,JA Aparisi Pozo,L Aperio Bella,G Arabidze,JP Araque,V Araujo Ferraz,R Araujo Pereira,ATH Arce,FA Arduh,JF Arguin,S Argyropoulos,J-H Arling,AJ Armbruster,LJ Armitage,A Armstrong,O Arnaez,H Arnold,A Artamonov,G Artoni,S Artz,S Asai,N Asbah,EM Asimakopoulou,L Asquith,K Assamagan,R Astalos,RJ Atkin,M Atkinson,NB Atlay,H Atmani,K Augsten,G Avolio,R Avramidou,MK Ayoub,AM Azoulay,G Azuelos,AE Baas,MJ Baca,H Bachacou,K Bachas,M Backes,F Backman,P Bagnaia,M Bahmani,H Bahrasemani,AJ Bailey,VR Bailey,JT Baines,M Bajic,C Bakalis,OK Baker,PJ Bakker,D Bakshi Gupta,S Balaji,EM Baldin,P Balek
Journal
Journal of High Energy Physics
Published Date
2020/1
Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb− 1 of Pb+ Pb collisions at= 5. 02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients v n and correlated fluctuations between two harmonics v n and v m. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v 1. The four-particle cumulants for elliptic flow, v 2, and triangular flow, v 3, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v 2 and v 3. The four-particle cumulant for quadrangular flow, v 4, is found to change sign in mid-central collisions. Correlations between two harmonics are studied with three-and four-particle mixed-harmonic cumulants, which indicate an anti …
Higgs boson production cross-section measurements and their EFT interpretation in the decay channel at 13 TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,A Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Ammara Ahmad,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,K Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Shahzad Ali,Malik Aliev,Gianluca Alimonti,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Francisco Alonso,Cristiano Alpigiani,E Alunno Camelia,M Alvarez Estevez,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,John Kenneth Anders,Stefio Yosse Andrean,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,MA Aparo,L Aperio Bella,N Aranzabal Barrio,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Kanae Asai,Shoji Asai,Thanawat Asawatavonvanich,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Volker Andreas Austrup,Giuseppe Avolio,Mohamad Kassem Ayoub,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,Evelin Bakos,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas,Johannes Balz
Journal
The European Physical Journal C
Published Date
2020/10
Higgs boson properties are studied in the four-lepton decay channel (where lepton = e, ) using 139 of proton–proton collision data recorded at 13 TeV by the ATLAS experiment at the Large Hadron Collider. The inclusive cross-section times branching ratio for decay is measured to be pb for a Higgs boson with absolute rapidity below 2.5, in good agreement with the Standard Model prediction of pb. Cross-sections times branching ratio are measured for the main Higgs boson production modes in several exclusive phase-space regions. The measurements are interpreted in terms of coupling modifiers and of the tensor structure of Higgs boson interactions using an effective field theory approach. Exclusion limits are set on the CP-even and CP-odd ‘beyond the Standard Model’ couplings of the Higgs boson to vector bosons, gluons and top quarks.
Search for new resonances in mass distributions of jet pairs using 139 fb−1 of pp collisions at = 13 TeV with the ATLAS detector
Authors
Georges Aad,Brad Abbott,Dale Charles Abbott,Adam Abed Abud,Kira Abeling,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,OS AbouZeid,Nadine L Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Baida Achkar,Shunsuke Adachi,Lennart Adam,C Adam Bourdarios,Leszek Adamczyk,Lukas Adamek,Jahred Adelman,Michael Adersberger,Aytul Adiguzel,Sofia Adorni,Tim Adye,AA Affolder,Yoav Afik,Christina Agapopoulou,Merve Nazlim Agaras,Anamika Aggarwal,Catalin Agheorghiesei,JA Aguilar-Saavedra,Faig Ahmadov,Waleed Syed Ahmed,Xiaocong Ai,Giulio Aielli,Shunichi Akatsuka,TPA Åkesson,Ece Akilli,AV Akimov,Konie Al Khoury,Gian Luigi Alberghi,Justin Albert,MJ Alconada Verzini,S Alderweireldt,Martin Aleksa,IN Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Alice Alfonsi,Fabrizio Alfonsi,Muhammad Alhroob,Babar Ali,Malik Aliev,Gianluca Alimonti,Steven Patrick Alkire,Corentin Allaire,BMM Allbrooke,Benjamin William Allen,PP Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri,M Alvarez Estevez,D Alvarez Piqueras,MG Alviggi,Y Amaral Coutinho,Alessandro Ambler,Luca Ambroz,Christoph Amelung,D Amidei,SP Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Fenfen An,Christos Anastopoulos,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,Attilio Andreazza,V Andrei,Christopher Ryan Anelli,Stylianos Angelidakis,Aaron Angerami,AV Anisenkov,Alberto Annovi,Claire Antel,Matthew Thomas Anthony,Egor Antipov,Mario Antonelli,DJA Antrim,Fabio Anulli,Masato Aoki,JA Aparisi Pozo,L Aperio Bella,JP Araque,V Araujo Ferraz,R Araujo Pereira,Chiara Arcangeletti,ATH Arce,Francisco Anuar Arduh,Jean-Francois Arguin,Spyridon Argyropoulos,J-H Arling,Aaron James Armbruster,Alexander Armstrong,Olivier Arnaez,Hannah Arnold,ZP Arrubarrena Tame,Giacomo Artoni,Sebastian Artz,Shoji Asai,Nedaa Asbah,Eleni Myrto Asimakopoulou,Lily Asquith,Jihad Assahsah,Ketevi Assamagan,Robert Astalos,Ryan Justin Atkin,Markus Atkinson,Naim Bora Atlay,Hicham Atmani,Kamil Augsten,Giuseppe Avolio,R Avramidou,Mohamad Kassem Ayoub,Adam Maxwell Azoulay,Georges Azuelos,Henri Bachacou,Konstantinos Bachas,Moritz Backes,Filip Backman,Paolo Bagnaia,Marzieh Bahmani,H Bahrasemani,AJ Bailey,Virginia Ruth Bailey,JT Baines,Milena Bajic,Christos Bakalis,OK Baker,Pepijn Johannes Bakker,D Bakshi Gupta,Shyam Balaji,EM Baldin,Petr Balek,Fabrice Balli,William Keaton Balunas
Journal
Journal of high energy physics
Published Date
2020/3
A search for new resonances decaying into a pair of jets is reported using the dataset of proton-proton collisions recorded at= 13 TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb− 1. The distribution of the invariant mass of the two leading jets is examined for local excesses above a data-derived estimate of the Standard Model background. In addition to an inclusive dijet search, events with jets identified as containing b-hadrons are examined specifically. No significant excess of events above the smoothly falling background spectra is observed. The results are used to set cross-section upper limits at 95% confidence level on a range of new physics scenarios. Model-independent limits on Gaussian-shaped signals are also reported. The analysis looking at jets containing b-hadrons benefits from improvements in the jet flavour …
Ben Waugh FAQs
What is Ben Waugh's h-index at University College London?
The h-index of Ben Waugh has been 74 since 2020 and 85 in total.
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The articles with the titles of
Search for non-resonant Higgs boson pair production in the 2b+ 2ℓ+ Emiss T fnal state in pp collisions at√ s= 13 TeV with the ATLAS detector
Search for magnetic monopoles and stable particles with high electric charges in = 13 TeV pp collisions with the ATLAS detector
Measurement of the cross-sections of the electroweak and total production of a Pair in Association With two Jets in Collisions at TeV with the ATLAS detector
Calibration of the light-flavour jet mistagging efficiency of the b-tagging algorithms with Z+ jets events using 139$$\textrm {fb}^{-1} $$ of ATLAS proton–proton collision data …
Measurement of cross sections for production of a Z boson in association with a flavor-inclusive or doubly b-tagged large-radius jet in proton-proton collisions at√ s= 13 TeV …
Search for top-philic heavy resonances in collisions at TeV with the ATLAS detector
Tools for estimating fake/non-prompt lepton backgrounds with the ATLAS detector at the LHC
Measurement of the c-jet mistagging efficiency in events using pp collision data at collected with the ATLAS detector
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are the top articles of Ben Waugh at University College London.
What are Ben Waugh's research interests?
The research interests of Ben Waugh are: particle physics, computing
What is Ben Waugh's total number of citations?
Ben Waugh has 31,881 citations in total.
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