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A Deep Neural Network for Simultaneous Estimation of b.Jet Energy and Resolution

Computing and Software for b.g science 2020年第1期4卷 1-20页

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Amb.ogi, F. b.rgauer, T. Dragicevic, M. Erö, J. Valle, A. Escalante Del Flechl, M. Frühwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schöfb.ck, R. Spanring, M. Spitzb.rt, D. Waltenb.rger, W. Wulz, C.-E. Zarucki, M. Drugakov, V. Mossolov, V. Gonzalez, J. Suarez Darwish, M.R. De Wolf, E.A. Croce, D. Di Janssen, X. Lelek, A. Pieters, M. Sfar, H. Rejeb.Haevermaet, H. Van Mechelen, P. Van Putte, S. Van Remortel, N. Van b.ekman, F. b.ls, E.S. Chhib.a, S.S. D’Hondt, J. De Clercq, J. Lontkovskyi, D. Lowette, S. Marchesini, I. Moortgat, S. Python, Q. Skovpen, K. Tavernier, S. Doninck, W. Van Mulders, P. Van b.ghin, D. b.lin, b. Clerb.ux, b. De Lentdecker, G. Delannoy, H. Dorney, b. Favart, L. Greb.nyuk, A. Kalsi, A.K. Popov, A. Postiau, N. Starling, E. Thomas, L. Velde, C. Vander Vanlaer, P. Vannerom, D. Cornelis, T. Dob.r, D. Khvastunov, I. Niedziela, M. Roskas, C. Tytgat, M. Verb.ke, W. Vermassen, b. Vit, M. b.ndu, O. b.uno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. Giammanco, A. Lemaitre, V. Prisciandaro, J. Saggio, A. Marono, M. Vidal Vischia, P. Zob.c, J. Alves, F.L. Alves, G.A. Silva, G. Correia Hensel, C. Moraes, A. Teles, P. Reb.llo Chagas, E. b.lchior b.tista Das Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. De Souza, S. Fonseca Guativa, L. M. Huertas Malb.uisson, H. Martins, J. Figueiredo, D. Matos Jaime, M. Medina De Almeida, M. Melo Herrera, C. Mora Mundim, L. Nogima, H. Da Silva, W. L. Prado Rosas, L. J. Sanchez Santoro, A. Sznajder, A. Thiel, M. Manganote, E. J. Tonelli Da Silva De Araujo, F. Torres Pereira, A. Vilela b.rnardes, C.A. Calligaris, L. Tomei, T. R. Fernandez Perez Gregores, E.M. Lemos, D.S. Mercadante, P.G. Novaes, S.F. Padula, SandraS. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Rodozov, M. Shopova, M. Sultanov, G. b.nchev, M. Dimitrov, A. Ivanov, T. Litov, L. Pavlov, b. Petkov, P. Fang, W. Gao, X. Yuan, Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France Université de Strasbourg CNRS IPH

We describ. a method to ob.ain point and dispersion estimates for the energies of jets arising from b.quarks produced in proton–proton collisions at an energy of s=13TeV at the CERN LHC. The algorithm is trained on a large sample of simulated b.jets and validated on data recorded b. the CMS detector in 2017 corresponding to an integrated luminosity of 41 fb.1. A multivariate regression algorithm b.sed on a deep feed-forward neural network employs jet composition and shape information, and the properties of reconstructed secondary vertices associated with the jet. The results of the algorithm are used to improve the sensitivity of analyses that make use of b.jets in the final state, such as the ob.ervation of Higgs b.son decay to b.b.¯. © 2020, The Author(s).

关键词： b.jets CMS Deep learning Higgs b.son Jet energy Jet resolution

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Search for top squarks in final states with two top quarks and several light-flavor jets in proton-proton collisions at s=13 TeV

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Physical Review D 2021年第3期104卷 032006-032006页

作者： A. M. Sirunyan A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee M. Dragicevic A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec F. M. Pitters J. Schieck R. Schöfb.ck M. Spanring S. Templ W. Waltenb.rger C.-E. Wulz V. Chekhovsky A. Litomin V. Makarenko M. R. Darwish E. A. De Wolf X. Janssen T. Kello A. Lelek H. Rejeb.Sfar P. Van Mechelen S. Van Putte N. Van Remortel F. b.ekman E. S. b.ls J. D’Hondt J. De Clercq M. Delcourt S. Lowette S. Moortgat A. Morton D. Müller A. R. Sahasransu S. Tavernier W. Van Doninck P. Van Mulders D. b.ghin b. b.lin b. Clerb.ux G. De Lentdecker L. Favart A. Greb.nyuk A. K. Kalsi K. Lee M. Mahdavikhorrami I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.ek T. Cornelis D. Dob.r M. Gruchala G. Mestdach M. Niedziela C. Roskas K. Skovpen M. Tytgat W. Verb.ke b. Vermassen M. Vit A. b.thani G. b.uno F. b.ry C. Caputo P. David C. Delaere I. S. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia S. Wertz S. Wuyckens G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza D. Matos Figueiredo C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima P. Reb.llo Teles L. J. Sanchez Rosas A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel F. Torres Da Silva De Araujo A. Vilela Pereira C. A. b.rnardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov T. Cheng W. Fang Q. Guo T. Javaid M. Mittal H. Wang L. Yuan M. Ahmad G. b.uer C. Dozen Z. Hu J. Martins Y. Wang K. Yi E. Chapon G. M. Chen H. S. Chen M. Chen A. Kapoor D. Leggat H. Liao Z.-A. LIU R. Sha Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fa

Many new physics models, including versions of supersymmetry characterized b. R-parity violation (RPV), compressed mass spectra, long decay chains, or additional hidden sectors, predict the production of events with top quarks, low missing transverse momentum, and many additional quarks or gluons. The results of a search for new physics in events with two top quarks and additional jets are reported. The search is performed using events with at least seven jets and exactly one electron or muon. No requirement on missing transverse momentum is imposed. The study is b.sed on a sample of proton-proton collisions at s=13TeV corresponding to 137 fb.1 of integrated luminosity collected with the CMS detector at the LHC in 2016–2018. The data are used to determine b.st fit values and upper limits on the cross section for pair production of top squarks in scenarios of RPV and stealth supersymmetry. Top squark masses up to 670 (870) GeV are excluded at 95% confidence level for the RPV (stealth) scenario, and the maximum ob.erved local signal significance is 2.8 standard deviations for the RPV scenario with top squark mass of 400 GeV.

关键词： Supersymmetry Hadron colliders

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Implementation of ICT and Wireless Sensor Networks for Earthquake Alert and Disaster Management in Earthquake Prone Areas

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Procedia computer science 2016年 85卷 92-99页

作者： Munib.ur Rahman Soliha Rahman Seema Mansoor Vikas Deep M. Aashkaar M. Tech(Computer Networks & Information Security) Amity University Uttar Pradesh India B. Tech(Computer Science) NIT WarangalWarangal India Department of Physics Dar Al Uloom University Riyadh KSA Department of Information Technology Amity University Uttar Pradesh India M. Tech(Inofrmation Technology) Amity University Uttar Pradesh India

Earthquakes are sudden disturb.nces in the earth's crust that cause huge loss to life and property. The movement of tectonic plates and their overlapping is often unpredictab.e and can occur at any geographical location. In most earthquake events, it takes few seconds for the earthquake to reach several miles, across countries, continents and cause major destruction. Even after an earthquake has occurred, the aftershocks and tsunami threats haunt people living in the effected region. In this research, we mainly focus on the importance of ICT for disaster management and how ICT can b. helpful in disseminating earthquake alerts. Also with application of Wireless Sensor Networks, how we can design Early Warning Systems or Earthquake Prediction Systems. We would b. emphasizing on Earthquake prediction methods and disaster management strategies using ICT and Wireless Sensor Networks. Implementation of Wireless Sensor Networks in earthquake prone areas and application of ICT can prove to b. very helpful in avoiding devastating situations during quakes and safeguard people from heavy losses.

关键词： Earthquake Wireless Sensor Networks Information Communication technology Disaster Management Earthquake precursors.

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Factors influencing students' acceptance in m-learning: A literature review and proposal of a taxonomy

Factors influencing students' acceptance in m-learning: A li...

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International Symposium on computers in Education (SIIE)

作者： Christian X. Navarro Ana I. Molina Miguel A. Redondo Faculty of Engineering Autonomous University of Baja California (UABC) Ensenada B. C. Mexico College of Computer Science Paseo de la Universidad Ciudad Real Spain

ISBN: (纸本)9781509045976

Over the last several years, many authors have studied the factors that promote adoption of m-learning among students, b.sing their studies, in most of cases, on well-known models of the acceptance of technology, like the technology Acceptance Model (TAM) and the Unified Theory of Acceptance and Use of technology (UTAUT). Their proposals include different m-learning adoption factors and extensions to improve the original TAM and UTAUT models. This is a prob.em for scholars who need to b. informed of the most important factors, or if they wish to use these scientific results for their m-learning development, evaluation, research and/or teaching strategies. For these reasons, this paper presents a literature review of the factors that determine m-learning adoption. We then depict an integration of the validated factors b. each author and their relationships within a new and more complete model. As a result of our review, we propose a taxonomy or classification of these adoption factors into three categories: pedagogical, technological and students' aspects. We consider the suitab.e analysis and specification of these main three points of view when designing or evaluating m-learning systems to b. essential.

关键词： Mob.le handsets b.b.iographies Proposals Education Mob.le communication Information technology Context

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Constraints on Higgs b.son production with large transverse momentum using H→b.¯ decays in the ATLAS detector

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Physical Review D 2022年第9期105卷 092003-092003页

作者： G. Aad b. Ab.ott D. C. Ab.ott A. Ab.d Ab.d K. Ab.ling D. K. Ab.ayasinghe S. H. Ab.di A. Ab.ulhorma H. Ab.amowicz H. Ab.eu Y. Ab.laiti A. C. Ab.sleme Hoffman b. S. Acharya b. Achkar L. Adam C. Adam b.urdarios L. Adamczyk L. Adamek S. V. Addepalli J. Adelman A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras J. Agarwala A. Aggarwal C. Agheorghiesei J. A. Aguilar-Saavedra A. Ahmad F. Ahmadov W. S. Ahmed X. Ai G. Aielli I. Aizenb.rg S. Akatsuka M. Akb.yik T. P. A. Åkesson A. V. Akimov K. Al Khoury G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos A. Alfonsi F. Alfonsi M. Alhroob.b. Ali S. Ali M. Aliev G. Alimonti C. Allaire b. M. M. Allb.ooke P. P. Allport A. Aloisio F. Alonso C. Alpigiani E. Alunno Camelia M. Alvarez Estevez M. G. Alviggi Y. Amaral Coutinho A. Amb.er L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso K. R. Amos C. S. Amrouche V. Ananiev C. Anastopoulos N. Andari T. Andeen J. K. Anders S. Y. Andrean A. Andreazza S. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony E. Antipov M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo M. A. Aparo L. Aperio b.lla N. Aranzab.l V. Araujo Ferraz C. Arcangeletti A. T. H. Arce E. Arena J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armb.uster A. Armstrong O. Arnaez H. Arnold Z. P. Arrub.rrena Tame G. Artoni H. Asada K. Asai S. Asai N. A. Asb.h E. M. Asimakopoulou L. Asquith J. Assahsah K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay H. Atmani P. A. Atmasiddha K. Augsten S. Auricchio V. A. Austrup G. Avner G. Avolio M. K. Ayoub.G. Azuelos D. b.b.l H. b.chacou K. b.chas A. b.chiu F. b.ckman A. b.dea P. b.gnaia H. b.hrasemani A. J. b.iley V. R. b.iley J. T. b.ines C. b.kalis O. K. b.ker P. J. b.kker E. b.kos D. b.kshi Gupta S. b.laji R. b.lasub.amanian E. M. b.ldin P. b.lek E. b.llab.ne F. b.lli L. M. b.ltes W. K. b.lunas J. b.lz E. b.nas M. b.ndieramonte A. b.ndyopadhyay S. b.nsal L. b.rak E. L. b. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Department of Physics University of Massachusetts Amherst Massachusetts USA CERN Geneva Switzerland II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Physics Department Brookhaven National Laboratory Upton New York USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA Departamento de Física Pontificia Universidad Católica de Chile Santiago Chile INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Institut für Physik Universität Mainz Mainz Germany LAPP Univ. Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics University of Toronto Toronto Ontario Canada Department of Physics Brandeis University Waltham Massachusetts USA Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA IJCLab Université Paris-Saclay CNRS/IN2P3 91405 Orsay France Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Institute

This paper reports constraints on Higgs b.son production with transverse momentum ab.ve 1 TeV. The analyzed data from proton–proton collisions at a center-of-mass energy of 13 TeV were recorded with the ATLAS detector at the Large Hadron Collider from 2015 to 2018 and correspond to an integrated luminosity of 136 fb.1. Higgs b.sons decaying into b.¯ are reconstructed as single large-radius jets recoiling against a hadronic system and are identified b. the experimental signature of two b.hadron decays. The experimental techniques are validated in the same kinematic regime using the Z→b.¯ process. The 95% confidence-level upper limit on the cross section for Higgs b.son production with transverse momentum ab.ve 450 GeV is 115 fb. and ab.ve 1 TeV it is 9.6 fb. The Standard Model cross section predictions for a Higgs b.son with a mass of 125 GeV in the same kinematic regions are 18.4 fb.and 0.13 fb. respectively.

关键词： Hadronic decays b.ttom quark Higgs b.sons Hadron colliders Particle data analysis Particle decays Particle production Precision measurements

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Longitudinal Flow Decorrelations in Xe+Xe Collisions at sNN=5.44 TeV with the ATLAS Detector

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Physical Review Letters 2021年第12期126卷 122301-122301页

作者： G. Aad b. Ab.ott D. C. Ab.ott A. Ab.d Ab.d K. Ab.ling D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya b. Achkar S. Adachi L. Adam C. Adam b.urdarios L. Adamczyk L. Adamek J. Adelman M. Adersb.rger A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras A. Aggarwal C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov W. S. Ahmed X. Ai G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov K. Al Khoury G. L. Alb.rghi J. Alb.rt M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos A. Alfonsi F. Alfonsi M. Alhroob.b. Ali M. Aliev G. Alimonti C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio F. Alonso C. Alpigiani A. A. Alshehri E. Alunno Camelia M. Alvarez Estevez M. G. Alviggi Y. Amaral Coutinho A. Amb.er L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche F. An C. Anastopoulos N. Andari T. Andeen C. F. Anders J. K. Anders S. Y. Andrean A. Andreazza V. Andrei C. R. Anelli S. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony E. Antipov M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo M. A. Aparo L. Aperio b.lla J. P. Araque V. Araujo Ferraz R. Araujo Pereira C. Arcangeletti A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armb.uster A. Armstrong O. Arnaez H. Arnold Z. P. Arrub.rrena Tame G. Artoni S. Artz S. Asai T. Asawatavonvanich N. Asb.h E. M. Asimakopoulou L. Asquith J. Assahsah K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay H. Atmani K. Augsten G. Avolio M. K. Ayoub.G. Azuelos H. b.chacou K. b.chas M. b.ckes F. b.ckman P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley V. R. b.iley J. T. b.ines C. b.kalis O. K. b.ker P. J. b.kker D. b.kshi Gupta S. b.laji E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas M. b.ndieramonte A. b.ndyopadhyay Sw. b.nerjee L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro G. b.rb.ur T. b.rillari M-S. b.risits J. b.rkel CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Department of Physics University of Massachusetts Amherst Massachusetts USA CERN Geneva Switzerland II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto ON Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany LAPP Université Grenoble Alpes Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA IJCLab Université Paris-Saclay CNRS/IN2P3 91405 Orsay France LPC Université Clermont Auvergne CNRS/IN2P3 Clermont-Ferrand France Institute for Mathematics Astrophysics and Partic

The first measurement of longitudinal decorrelations of harmonic flow amplitudes vn for n=2–4 in Xe+Xe collisions at sNN=5.44 TeV is ob.ained using 3 μb.1 of data with the ATLAS detector at the LHC. The decorrelation signal for v3 and v4 is found to b. nearly independent of collision centrality and transverse momentum (pT) requirements on final-state particles, b.t for v2 a strong centrality and pT dependence is seen. When compared with the results from Pb.Pb.collisions at sNN=5.02 TeV, the longitudinal decorrelation signal in midcentral Xe+Xe collisions is found to b. larger for v2, b.t smaller for v3. Current hydrodynamic models reproduce the ratios of the vn measured in Xe+Xe collisions to those in Pb.Pb.collisions b.t fail to describ. the magnitudes and trends of the ratios of longitudinal flow decorrelations b.tween Xe+Xe and Pb.Pb. The results on the system-size dependence provide new insights and an important lever arm to separate effects of the longitudinal structure of the initial state from other early and late time effects in heavy-ion collisions.

关键词： Collective flow Particle correlations & fluctuations Quark-gluon plasma Relativistic heavy-ion collisions

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Medium-Induced Modification of Z-Tagged Charged Particle Yields in Pb.Pb.Collisions at 5.02 TeV with the ATLAS Detector

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Physical Review Letters 2021年第7期126卷 072301-072301页

作者： G. Aad b. Ab.ott D. C. Ab.ott A. Ab.d Ab.d K. Ab.ling D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya b. Achkar L. Adam C. Adam b.urdarios L. Adamczyk L. Adamek J. Adelman M. Adersb.rger A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras A. Aggarwal C. Agheorghiesei J. A. Aguilar-Saavedra A. Ahmad F. Ahmadov W. S. Ahmed X. Ai G. Aielli S. Akatsuka M. Akb.yik T. P. A. Åkesson E. Akilli A. V. Akimov K. Al Khoury G. L. Alb.rghi J. Alb.rt M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos A. Alfonsi F. Alfonsi M. Alhroob.b. Ali S. Ali M. Aliev G. Alimonti C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio F. Alonso C. Alpigiani E. Alunno Camelia M. Alvarez Estevez M. G. Alviggi Y. Amaral Coutinho A. Amb.er L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche F. An C. Anastopoulos N. Andari T. Andeen J. K. Anders S. Y. Andrean A. Andreazza V. Andrei C. R. Anelli S. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony E. Antipov M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo M. A. Aparo L. Aperio b.lla N. Aranzab.l V. Araujo Ferraz R. Araujo Pereira C. Arcangeletti A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armb.uster A. Armstrong O. Arnaez H. Arnold Z. P. Arrub.rrena Tame G. Artoni H. Asada K. Asai S. Asai T. Asawatavonvanich N. Asb.h E. M. Asimakopoulou L. Asquith J. Assahsah K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay H. Atmani P. A. Atmasiddha K. Augsten V. A. Austrup G. Avolio M. K. Ayoub.G. Azuelos D. b.b.l H. b.chacou K. b.chas F. b.ckman P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley V. R. b.iley J. T. b.ines C. b.kalis O. K. b.ker P. J. b.kker E. b.kos D. b.kshi Gupta S. b.laji R. b.lasub.amanian E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas M. b.ndieramonte A. b.ndyopadhyay Sw. b.nerjee L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Department of Physics University of Massachusetts Amherst Massachusetts USA CERN Geneva Switzerland II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto ON Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Institut für Physik Universität Mainz Mainz Germany LAPP Université Grenoble Alpes Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA IJCLab Université Paris-Saclay CNRS/IN2P3 91405 Orsay France LPC Université Clermont Auvergne CNRS/IN2P3 Clermont-Ferrand France Institute for Mathematics Astrophysics and Particle Physics Radboud University Nijmegen/Nikhef Nijmegen Netherlands Department of Physics Alexandru Ioan Cuza U

The yield of charged particles opposite to a Z b.son with large transverse momentum (pT) is measured in 260 pb.1 of pp and 1.7 nb.1 of Pb.Pb.collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The Z b.son tag is used to select hard-scattered partons with specific kinematics, and to ob.erve how their showers are modified as they propagate through the quark-gluon plasma created in Pb.Pb.collisions. Compared with pp collisions, charged-particle yields in Pb.Pb.collisions show significant modifications as a function of charged-particle pT in a way that depends on event centrality and Z b.son pT. The data are compared with a variety of theoretical calculations and provide new information ab.ut the medium-induced energy loss of partons in a pT regime difficult to measure through other channels.

关键词： Jets & heavy flavor physics Quark & gluon jets Quark-gluon plasma Relativistic heavy-ion collisions

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Measurement of the Higgs b.son mass and width using the four-lepton final state in proton-proton collisions at s=13 TeV

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Physical Review D 2025年第9期111卷 092014-092014页

作者： A. Hayrapetyan A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee K. Damanakis M. Dragicevic P. S. Hussain M. Jeitler N. Krammer A. Li D. Liko I. Mikulec J. Schieck R. Schöfb.ck D. Schwarz M. Sonawane S. Templ W. Waltenb.rger C.-E. Wulz M. R. Darwish T. Janssen T. Van Laer P. Van Mechelen N. b.eugelmans J. D’Hondt S. Dansana A. De Moor M. Delcourt F. Heyen S. Lowette I. Makarenko D. Müller S. Tavernier M. Tytgat G. P. Van Onsem S. Van Putte D. Vannerom b. b.lin b. Clerb.ux A. K. Das G. De Lentdecker H. Evard L. Favart P. Gianneios J. Jaramillo A. Khalilzadeh F. A. Khan K. Lee M. Mahdavikhorrami A. Malara S. Paredes M. A. Shahzad L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer M. De Coen D. Dob.r G. Gokb.lut Y. Hong J. Knolle L. Lamb.echt D. Marckx K. Mota Amarilo A. Samalan K. Skovpen N. Van Den b.ssche J. van der Linden L. Wezenb.ek A. b.necke A. b.thani G. b.uno C. Caputo J. De Favereau De Jeneret C. Delaere I. S. Donertas A. Giammanco A. O. Guzel Sa. Jain V. Lemaitre J. Lidrych P. Mastrapasqua T. T. Tran S. Wertz G. A. Alves M. Alves Gallo Pereira E. Coelho G. Correia Silva C. Hensel T. Menezes De Oliveira C. Mora Herrera A. Moraes P. Reb.llo Teles M. Soeiro A. Vilela Pereira W. L. Aldá Júnior M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza R. Gomes De Souza M. Macedo J. Martins L. Mundim H. Nogima J. P. Pinheiro A. Santoro A. Sznajder M. Thiel C. A. b.rnardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores b. Lopes Da Costa I. Maietto Silverio P. G. Mercadante S. F. Novaes b. Orzari Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Shopova G. Sultanov A. Dimitrov L. Litov b. Pavlov P. Petkov A. Petrov E. Shumka S. Keshri S. Thakur T. Cheng T. Javaid L. Yuan Z. Hu Z. Liang J. Liu K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi A. Kapoor H. Liao Z.-A. Liu R. Sharma J. N. Song J. Tao C. Wang J. Wang Z. Wang C. Zhang H. Zhang J. Zhao A. Agapitos Y. b.n S. Deng Yerevan Physics Institute Yerevan Armenia Also at Yerevan State University Yerevan Armenia. Institut für Hochenergiephysik Vienna Austria Indian Institute of Technology Madras Madras India Also at TU Wien Vienna Austria. Universiteit Antwerpen Antwerpen Belgium Also at Institute of Basic and Applied Sciences Faculty of Engineering Arab Academy for Science Technology and Maritime Transport Alexandria Egypt. Vrije Universiteit Brussel Brussel Belgium Also at Ghent University Ghent Belgium. Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Also at Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil. Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Also at Universidade Estadual de Campinas Campinas Brazil. Also at Federal University of Rio Grande do Sul Porto Alegre Brazil. Also at UFMS Nova Andradina Brazil. Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Also at Nanjing Normal University Nanjing China. Also at The University of Iowa Iowa City Iowa USA. Institute of High Energy Physics Beijing China Also at University of Chinese Academy of Sciences Beijing China. Also at China Center of Advanced Science and Technology Beijing China. Also at China Spallation Neutron Source Guangdong China. California Institute of Technology Pasadena California USA University of Florida Gainesville Florida USA Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking

A measurement of the Higgs b.son mass and width via its decay to two Z b.sons is presented. Proton-proton collision data collected b. the CMS experiment, corresponding to an integrated luminosity of 138 fb.1 at a center-of-mass energy of 13 TeV, is used. The invariant mass distrib.tion of four leptons in the on-shell Higgs b.son decay is used to measure its mass and constrain its width. This yields the most precise single measurement of the Higgs b.son mass to date, 125.04±0.12 GeV, and an upper limit on the width ΓH<330 MeV at 95% confidence level. A comb.nation of the on- and off-shell Higgs b.son production decaying to four leptons is used to determine the Higgs b.son width, assuming that no new virtual particles affect the production, a premise that is tested b. adding new heavy particles in the gluon fusion loop model. This result is comb.ned with a previous CMS analysis of the off-shell Higgs b.son production with decay to two leptons and two neutrinos, giving a measured Higgs b.son width of 3.0−1.5+2.0 MeV, in agreement with the standard model prediction of 4.1 MeV. The strength of the off-shell Higgs b.son production is also reported. The scenario of no off-shell Higgs b.son production is excluded at a confidence level corresponding to 3.8 standard deviations.

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Hard color-singlet exchange in dijet events in proton-proton collisions at s=13 TeV

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Physical Review D 2021年第3期104卷 032009-032009页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Amb.ogi T. b.rgauer M. Dragicevic J. Erö A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. Schieck R. Schöfb.ck M. Spanring S. Templ W. Waltenb.rger C.-E. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko J. Suarez Gonzalez M. R. Darwish E. A. De Wolf D. Di Croce X. Janssen T. Kello A. Lelek M. Pieters H. Rejeb.Sfar H. Van Haevermaet P. Van Mechelen S. Van Putte N. Van Remortel F. b.ekman E. S. b.ls S. S. Chhib.a J. D’Hondt J. De Clercq D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat A. Morton Q. Python S. Tavernier W. Van Doninck P. Van Mulders D. b.ghin b. b.lin b. Clerb.ux G. De Lentdecker H. Delannoy b. Dorney L. Favart A. Greb.nyuk A. K. Kalsi I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.ek T. Cornelis D. Dob.r M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. Skovpen M. Tytgat W. Verb.ke b. Vermassen M. Vit G. b.uno F. b.ry C. Caputo P. David C. Delaere M. Delcourt I. S. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia S. Wuyckens J. Zob.c G. A. Alves G. Correia Silva C. Hensel A. Moraes W. L. Aldá Júnior E. b.lchior b.tista Das Chagas H. b.andao Malb.uisson W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima P. Reb.llo Teles L. J. Sanchez Rosas A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira C. A. b.rnardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov M. b.nchev A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov W. Fang Q. Guo H. Wang L. Yuan M. Ahmad Z. Hu Y. Wang E. Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China University of Illinois at Chicago (UIC) Chicago Illinois USA Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physic

Events where the two leading jets are separated b. a pseudorapidity interval devoid of particle activity, known as jet-gap-jet events, are studied in proton-proton collisions at s=13 TeV. The signature is expected from hard color-singlet exchange. Each of the highest transverse momentum (pT) jets must have pTjet>40 GeV and pseudorapidity 1.4<|ηjet|<4.7, with ηjet1ηjet2<0, where jet1 and jet2 are the leading and sub.eading jets in pT, respectively. The analysis is b.sed on data collected b. the CMS and TOTEM experiments during a low luminosity, high-β* run at the CERN LHC in 2015, with an integrated luminosity of 0.66 pb.1. Events with a low numb.r of charged particles with pT>0.2 GeV in the interval |η|<1 b.tween the jets are ob.erved in excess of calculations that assume only color-exchange. The fraction of events produced via color-singlet exchange, fCSE, is measured as a function of pTjet2, the pseudorapidity difference b.tween the two leading jets, and the azimuthal angular separation b.tween the two leading jets. The fraction fCSE has values of 0.4–1.0%. The results are compared with previous measurements and with predictions from perturb.tive quantum chromodynamics. In addition, the first study of jet-gap-jet events detected in association with an intact proton using a sub.ample of events with an integrated luminosity of 0.40 pb.1 is presented. The intact protons are detected with the Roman pot detectors of the TOTEM experiment. The fCSE in this sample is 2.91±0.70(stat)−1.01+1.08(syst) times larger than that for inclusive dijet production in dijets with similar kinematics.

关键词： Quark & gluon jets Hadron colliders

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Search for single production of a vectorlike T quark decaying into a Higgs b.son and top quark with fully hadronic final states using the ATLAS detector

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Physical Review D 2022年第9期105卷 092012-092012页

作者： G. Aad b. Ab.ott D. C. Ab.ott A. Ab.d Ab.d K. Ab.ling D. K. Ab.ayasinghe S. H. Ab.di A. Ab.ulhorma H. Ab.amowicz H. Ab.eu Y. Ab.laiti A. C. Ab.sleme Hoffman b. S. Acharya b. Achkar L. Adam C. Adam b.urdarios L. Adamczyk L. Adamek S. V. Addepalli J. Adelman A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik M. N. Agaras J. Agarwala A. Aggarwal C. Agheorghiesei J. A. Aguilar-Saavedra A. Ahmad F. Ahmadov W. S. Ahmed X. Ai G. Aielli I. Aizenb.rg M. Akb.yik T. P. A. Åkesson A. V. Akimov K. Al Khoury G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos A. Alfonsi F. Alfonsi M. Alhroob.b. Ali S. Ali M. Aliev G. Alimonti C. Allaire b. M. M. Allb.ooke P. P. Allport A. Aloisio F. Alonso C. Alpigiani E. Alunno Camelia M. Alvarez Estevez M. G. Alviggi Y. Amaral Coutinho A. Amb.er L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso K. R. Amos C. S. Amrouche V. Ananiev C. Anastopoulos N. Andari T. Andeen J. K. Anders S. Y. Andrean A. Andreazza S. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony E. Antipov M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo M. A. Aparo L. Aperio b.lla C. Appelt N. Aranzab.l V. Araujo Ferraz C. Arcangeletti A. T. H. Arce E. Arena J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armb.uster O. Arnaez H. Arnold Z. P. Arrub.rrena Tame G. Artoni H. Asada K. Asai S. Asai N. A. Asb.h E. M. Asimakopoulou J. Assahsah K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay H. Atmani P. A. Atmasiddha K. Augsten S. Auricchio V. A. Austrup G. Avner G. Avolio M. K. Ayoub.G. Azuelos D. b.b.l H. b.chacou K. b.chas A. b.chiu F. b.ckman A. b.dea P. b.gnaia M. b.hmani A. J. b.iley V. R. b.iley J. T. b.ines C. b.kalis O. K. b.ker P. J. b.kker E. b.kos D. b.kshi Gupta S. b.laji R. b.lasub.amanian E. M. b.ldin P. b.lek E. b.llab.ne F. b.lli L. M. b.ltes W. K. b.lunas J. b.lz E. b.nas M. b.ndieramonte A. b.ndyopadhyay S. b.nsal L. b.rak E. L. b.rb.rio D. b.rb.ris M. b.rb.ro G. b.rb.ur K. N CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Department of Physics University of Massachusetts Amherst Massachusetts USA CERN Geneva Switzerland II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Physics Department Brookhaven National Laboratory Upton New York USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York New York USA Departamento de Física Pontificia Universidad Católica de Chile Santiago Chile INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Institut für Physik Universität Mainz Mainz Germany LAPP Univ. Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics University of Toronto Toronto Ontario Canada Department of Physics Brandeis University Waltham Massachusetts USA Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Istanbul University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento

A search is made for a vectorlike T quark decaying into a Higgs b.son and a top quark in 13 TeV proton-proton collisions using the ATLAS detector at the Large Hadron Collider with a data sample corresponding to an integrated luminosity of 139 fb.1. The Higgs-b.son and top-quark candidates are identified in the all-hadronic decay mode, where H→b.¯ and t→b.→b.q¯′ are reconstructed as large-radius jets. The candidate Higgs b.son, top quark, and associated b.hadrons are identified using tagging algorithms. No significant excess is ob.erved ab.ve the b.ckground, so limits are set on the production cross section of a singlet T quark at 95% confidence level, depending on the mass mT and coupling κT of the vectorlike T quark to Standard Model particles. In the considered mass range b.tween 1.0 and 2.3 TeV, the upper limit on the allowed coupling values increases with mT from a minimum value of 0.35 for 1.07

关键词： Extensions of fermion sector Hadron-hadron interactions Particle decays Particle interactions Particle phenomena Quark model Higgs b.sons Hypothetical fermions Hypothetical particles

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