Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at √s=13 TeV with the ATLAS detector

被引：13

作者：

Aad, G. ^{[158
]}

Abbott, B. ^{[188
]}

Abbott, D. C. ^{[159
]}

Abud, A. Abed ^{[61
]}

Abeling, K. ^{[82
]}

Abhayasinghe, D. K. ^{[149
]}

Abidi, S. H. ^{[49
]}

AbouZeid, O. S. ^{[65
]}

Abraham, N. L. ^{[226
]}

Abramowicz, H. ^{[232
]}

Abreu, H. ^{[231
]}

Abulaiti, Y. ^{[8
]}

Abusleme Hoffman, A. C. ^{[212
]}

Acharya, B. S. ^{[105
,106
,269
]}

Achkar, B. ^{[82
]}

Adam, L. ^{[156
]}

Bourdarios, C. Adam ^{[7
]}

Adamczyk, L. ^{[135
]}

Adamek, L. ^{[238
]}

Adelman, J. ^{[179
]}

Adiguzel, A. ^{[16
,280
]}

Adorni, S. ^{[83
]}

Adye, T. ^{[209
]}

Affolder, A. A. ^{[211
]}

OOncel, O. ^{[38
]}

Afik, Y. ^{[231
]}

Agapopoulou, C. ^{[103
]}

Agaras, M. N. ^{[63
]}

Aggarwal, A. ^{[176
]}

Agheorghiesei, C. ^{[43
]}

Aguilar-Saavedra, J. A. ^{[199
,204
,279
]}

Ahmad, A. ^{[61
]}

Ahmadov, F. ^{[129
]}

Ahmed, W. S. ^{[160
]}

Ai, X. ^{[73
,74
]}

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

Akatsuka, S. ^{[138
]}

Akbiyik, M. ^{[156
]}

Akesson, T. P. A. ^{[152
]}

Akilli, E. ^{[83
]}

Akimov, A., V ^{[167
]}

Al Khoury, K. ^{[64
]}

Alberghi, G. L. ^{[35
,36
,37
]}

Albert, J. ^{[249
]}

Verzini, M. J. Alconada ^{[232
]}

Alderweireldt, S. ^{[61
]}

Aleksa, M. ^{[61
]}

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

Alexa, C. ^{[42
]}

Alexopoulos, T. ^{[12
]}

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, Turkey

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

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

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

[8] Argonne Natl Lab, Div High Energy Phys, 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, Turkey

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

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

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

[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] Univ Nacl Colombia, Dept Fis, Bogota, Colombia

[35] INFN Bologna, Bologna, Italy

[36] Univ Bologna, Dipartimento Fis, Bogota, Colombia

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

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

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

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

[41] Transilvania Univ Brasov, Brasov, Romania

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

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

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

[45] Univ Politehn Bucuresti, Bucharest, Romania

[46] West Univ Timisoara, Timisoara, Romania

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

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

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

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

来源：

PHYSICS LETTERS B | 2021年 / 819卷

基金：

欧盟地平线“2020”; 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; 巴西圣保罗研究基金会;

关键词：

LEADING ORDER QCD; STRAHLUNG; FUSION;

D O I：

10.1016/j.physletb.2021.136412

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m(ll) < 30 GeV is presented. The analysis is performed using 139 fb(-1) of proton-proton collision data, produced by the LHC at a centre-of-mass energy of 13 TeV and collected by the ATLAS experiment. Evidence for the H -> ll(gamma) process is found with a significance of 3.2 over the background-only hypothesis, compared to an expected significance of 2.1 for the Standard Model prediction. The best-fit value of the signal-strength parameter, defined as the ratio of the observed signal yield to the one expected in the Standard Model, is mu = 1.5 +/- 0.5. The Higgs boson production cross-section times the H -> ll(gamma) branching ratio for m(ll) < 30 GeV is determined to be 8.7(-2.7)(+2.8) fb. (C) 2021 The Author. Published by Elsevier B.V.

引用

页数：22

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