Search for flavour-changing neutral-current couplings between the top quark and the photon with the ATLAS detector at √s=13 TeV

被引：10

作者：

Aad, G. ^{[159
]}

Abbott, B. ^{[190
]}

Abbott, D. C. ^{[160
]}

Abud, A. Abed ^{[60
]}

Abeling, K. ^{[81
]}

Abhayasinghe, D. K. ^{[150
]}

Abidi, S. H. ^{[240
]}

AbouZeid, O. S. ^{[64
]}

Abraham, N. L. ^{[227
]}

Abramowicz, H. ^{[233
]}

Abreu, H. ^{[232
]}

Abulaiti, Y. ^{[8
]}

Acharya, B. S. ^{[105
,106
,268
]}

Achkar, B. ^{[81
]}

Adachi, S. ^{[235
,236
]}

Adam, L. ^{[157
]}

Adam, Bourdarios C. ^{[7
]}

Adamczyk, L. ^{[136
]}

Adamek, L. ^{[240
]}

Adelman, J. ^{[180
]}

Adersberger, M. ^{[171
]}

Adiguzel, A. ^{[16
]}

Adorni, S. ^{[82
]}

Adye, T. ^{[211
]}

Affolder, A. A. ^{[213
]}

Afik, Y. ^{[232
]}

Agapopoulou, C. ^{[103
]}

Agaras, M. N. ^{[62
]}

Aggarwal, A. ^{[177
]}

Agheorghiesei, C. ^{[42
]}

Aguilar-Saavedra, J. A. ^{[201
,206
,280
]}

Ahmadov, F. ^{[129
]}

Ahmed, W. S. ^{[161
]}

Ai, X. ^{[26
,27
]}

Aielli, G. ^{[120
,121
]}

Akatsuka, S. ^{[139
]}

Akesson, T. P. A. ^{[153
]}

Akilli, E. ^{[82
]}

Akimov, A., V ^{[168
]}

Al Khoury, K. ^{[103
]}

Alberghi, G. L. ^{[34
,35
,36
]}

Albert, J. ^{[251
]}

Verzini, M. J. Alconada ^{[233
]}

Alderweireldt, S. ^{[60
]}

Aleksa, M. ^{[60
]}

Aleksandrov, I. N. ^{[129
]}

Alexa, C. ^{[41
]}

Alexopoulos, T. ^{[12
]}

Alfonsi, A. ^{[178
,179
]}

Alfonsi, F. ^{[34
,35
,36
]}

机构：

[1] Univ Adelaide, Dept Phys, Adelaide, SA, Australia

[2] SUNY Albany, Dept Phys, Albany, NY 12222 USA

[3] Univ Alberta, Dept Phys, Edmonton, AB, Canada

[4] Ankara Univ, Dept Phys, Ankara, Turkiye

[5] Istanbul Aydin Univ, Applicat & Res Ctr Adv Studies, Istanbul, Turkiye

[6] TOBB Univ Econ & Technol, Div Phys, Ankara, Turkiye

[7] Univ Grenoble Alpes, Univ Savoie Mt Blanc, CNRS, IN2P3,LAPP, Annecy, France

[8] Argonne Natl Lab, High Energy Phys Div, 9700 S Cass Ave, Argonne, IL 60439 USA

[9] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[10] Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA

[11] Natl & Kapodistrian Univ Athens, Phys Dept, Athens, Greece

[12] Natl Tech Univ Athens, Phys Dept, Zografos, Greece

[13] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[14] Bahcesehir Univ, Fac Engn & Nat Sci, Istanbul, Turkiye

[15] Istanbul Bilgi Univ, Fac Engn & Nat Sci, Istanbul, Turkiye

[16] Bogazici Univ, Dept Phys, Istanbul, Turkiye

[17] Gaziantep Univ, Dept Phys Engn, Gaziantep, Turkiye

[18] Azerbaijan Acad Sci, Inst Phys, Baku, Azerbaijan

[19] Barcelona Inst Sci & Technol, Inst Fis Altes Energies IFAE, Barcelona, Spain

[20] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[21] Tsinghua Univ, Phys Dept, Beijing, Peoples R China

[22] Nanjing Univ, Dept Phys, Nanjing, Peoples R China

[23] Univ Chinese Acad Sci UCAS, Beijing, Peoples R China

[24] Univ Belgrade, Inst Phys, Belgrade, Serbia

[25] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[26] Lawrence Berkeley Natl Lab, Phys Div, Berkeley, CA USA

[27] Univ Calif Berkeley, Berkeley, CA 94720 USA

[28] Humboldt Univ, Inst Phys, Berlin, Germany

[29] Univ Bern, Albert Einstein Ctr Fundamental Phys, Bern, Switzerland

[30] Univ Bern, Lab High Energy Phys, Bern, Switzerland

[31] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

[32] Univ Antonio Narino, Fac Ciencias, Bogota, Colombia

[33] Univ Antonio Narino, Ctr Invest, Bogota, Colombia

[34] INFN Bologna, Bologna, Italy

[35] Univ Bologna, Dipartimento Fis, Bologna, Italy

[36] Ist Nazl Fis Nucl, Sez Bologna, Bologna, Italy

[37] Univ Bonn, Phys Inst, Bonn, Germany

[38] Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA

[39] Brandeis Univ, Dept Phys, Waltham, MA 02254 USA

[40] Transilvania Univ Brasov, Brasov, Romania

[41] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania

[42] Alexandru Ioan Cuza Univ, Dept Phys, Iasi, Romania

[43] Natl Inst Res & Dev Isotop & Mol Technol, Phys Dept, Cluj Napoca, Romania

[44] West Univ Timisoara, Timisoara, Romania

[45] Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia

[46] Slovak Acad Sci, Dept Subnucl Phys, Inst Expt Phys, Kosice, Slovakia

[47] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[48] Univ Buenos Aires, Dept Fis, Buenos Aires, DF, Argentina

[49] Calif State Univ Long Beach, Long Beach, CA 90840 USA

[50] Univ Cambridge, Cavendish Lab, Cambridge, England

来源：

PHYSICS LETTERS B | 2023年 / 842卷

基金：

巴西圣保罗研究基金会; 英国科学技术设施理事会; 加拿大自然科学与工程研究理事会; 欧盟地平线“2020”;

关键词：

PAIR PRODUCTION; PLUS PLUS; DECAYS;

D O I：

10.1016/j.physletb.2022.137379

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This letter documents a search for flavour-changing neutral currents (FCNCs), which are strongly sup-pressed in the Standard Model, in events with a photon and a top quark with the ATLAS detector. The analysis uses data collected in pp collisions at & RADIC;s =13 TeV during Run 2 of the LHC, corresponding to an integrated luminosity of 139 fb-1. Both FCNC top-quark production and decay are considered. The final state consists of a charged lepton, missing transverse momentum, a b-tagged jet, one high-momentum photon and possibly additional jets. A multiclass deep neural network is used to classify events either as signal in one of the two categories, FCNC production or decay, or as background. No significant ex-cess of events over the background prediction is observed and 95% CL upper limits are placed on the strength of left-and right-handed FCNC interactions. The 95% CL bounds on the branching fractions for the FCNC top-quark decays, estimated (expected) from both top-quark production and decay, are B(t & RARR; u & gamma; ) < 0.85 (0.88+0.37 -0.25) x 10-5 and B(t & RARR; c & gamma; ) < 4.2 (3.40+1.35-0.95) x 10-5 for a left-handed tq & gamma; cou-pling, and B(t & RARR; u & gamma; ) < 1.2 (1.20+0.50 -0.33) x10-5 and B(t & RARR; c & gamma; ) < 4.5 (3.70+1.47 -1.03) x10-5 for a right-handed coupling. & COPY; 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.

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