Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of τ-leptons in pp collisions at √s=13 TeV with the ATLAS detector

被引：0

作者：

Aad, G. ^{[157
]}

Abbott, B. ^{[178
]}

Abbott, D. C. ^{[158
]}

Abeling, K. ^{[82
]}

Abidi, S. H. ^{[46
]}

Aboulhorma, A. ^{[60
]}

Abramowicz, H. ^{[224
]}

Abreu, H. ^{[223
]}

Abulaiti, Y. ^{[175
]}

Abusleme Hoffman, A. C. ^{[201
]}

Acharya, B. S. ^{[105
,106
,259
]}

Achkar, B. ^{[82
]}

Adam, L. ^{[155
]}

Adam Bourdarios, C. ^{[5
]}

Adamczyk, L. ^{[135
]}

Adamek, L. ^{[229
]}

Addepalli, S. V. ^{[37
]}

Adelman, J. ^{[172
]}

Adiguzel, A. ^{[28
]}

Adorni, S. ^{[83
]}

Adye, T. ^{[198
]}

Affolder, A. A. ^{[200
]}

Afik, Y. ^{[61
]}

Agaras, M. N. ^{[14
]}

Agarwala, J. ^{[114
,115
]}

Aggarwal, A. ^{[155
]}

Agheorghiesei, C. ^{[40
]}

Aguilar-Saavedra, J. A. ^{[193
]}

Ahmad, A. ^{[61
]}

Ahmadov, F. ^{[13
,61
,267
]}

Ahmed, W. S. ^{[159
]}

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

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

Aizenberg, I. ^{[244
]}

Akbiyik, M. ^{[155
]}

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

Akimov, A. V. ^{[61
]}

Al Khoury, K. ^{[64
]}

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

Albert, J. ^{[240
]}

Albicocco, P. ^{[79
,80
]}

Alconada Verzini, M. J. ^{[142
,143
]}

Alderweireldt, S. ^{[78
]}

Aleksa, M. ^{[61
]}

Aleksandrov, I. N. ^{[61
]}

Alexa, C. ^{[39
]}

Alexopoulos, T. ^{[11
]}

Alfonsi, A. ^{[170
,171
]}

Alfonsi, F. ^{[34
]}

Alhroob, M. ^{[178
]}

机构：

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

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

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

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

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

[6] Univ Paris Cite, APC, CNRS, IN2P3, Paris, France

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[28] Istanbul Univ, Dept Phys, Istanbul, Turkiye

[29] Istinye Univ, Istanbul, Turkiye

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

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

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

[33] Univ Bologna, Dipartimento Fis & Astron A Righi, Bologna, Italy

[34] INFN Sez Bologna, Bologna, Italy

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

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

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

[38] Transilvania Univ Brasov, Brasov, Romania

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

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

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

[42] Univ Politehn Bucuresti, Bucharest, Romania

[43] West Univ Timisoara, Timisoara, Romania

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

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

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

[47] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, Buenos Aires, DF, Argentina

[48] Univ Buenos Aires, CONICET, Inst Fis Buenos Aires IFIBA, Buenos Aires, DF, Argentina

[49] Calif State Univ Fresno, Fresno, CA 93740 USA

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

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2023年 / 06期

基金：

巴西圣保罗研究基金会; 加拿大自然科学与工程研究理事会;

关键词：

Flavour Changing Neutral Currents; Hadron-Hadron Scattering; Higgs Physics; Top Physics; DECAYS; STANDARD; PROGRAM;

D O I：

10.1007/JHEP06(2023)155

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A search for flavour-changing neutral current (FCNC) tqH interactions involving a top quark, another up-type quark (q = u, c), and a Standard Model (SM) Higgs boson decaying into a tau-lepton pair (H -> tau(+)tau(-)) is presented. The search is based on a dataset of pp collisions at root s = 13 TeV that corresponds to an integrated luminosity of 139 fb(-1) recorded with the ATLAS detector at the Large Hadron Collider. Two processes are considered: single top quark FCNC production in association with a Higgs boson (pp -> tH), and top quark pair production in which one of top quarks decays into Wb and the other decays into qH through the FCNC interactions. The search selects events with two hadronically decaying tau-lepton candidates (tau(had)) or at least one tau(had) with an additional lepton (e, mu), as well as multiple jets. Event kinematics is used to separate signal from the background through a multivariate discriminant. A slight excess of data is observed with a significance of 2.3 sigma above the expected SM background, and 95% CL upper limits on the t -> qH branching ratios are derived. The observed (expected) 95% CL upper limits set on the t -> cH and t -> uH branching ratios are 9.4x10(-4)(4.8(-1.4)(+2.2) x 10(-4)) and 6.9x10(-4) (3.5(-1.0)(+1.5) x10(-4)), respectively. The corresponding combined observed (expected) upper limits on the dimension-6 operator Wilson coefficients in the effective tqH couplings are C-c phi < 1.35 (0.97) and C-u phi < 1.16 (0.82).

引用

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Affolder, A. A.
Afik, Y.
Agapopoulou, C.
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Agarwala, J.
Aggarwal, A.
Agheorghiesei, C.
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Ahmad, A.
Ahmadov, F.
Ahmed, W. S.
Ai, X.
Aielli, G.
Aizenberg, I
Akatsuka, S.
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Akesson, T. P. A.
Akimov, A., V
Al Khoury, K.
Alberghi, G. L.
Albert, J.
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AbouZeid, O. S.
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Abulaiti, Y.
Acharya, B. S.
Achkar, B.
Adam, L.
Bourdarios, C. Adam
Adamczyk, L.
Adamek, L.
Adelman, J.
Adiguzel, A.
Adorni, S.
Adye, T.
Affolder, A. A.
Afik, Y.
Agapopoulou, C.
Agaras, M. N.
Aggarwal, A.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahmad, A.
Ahmadov, F.
Ahmed, W. S.
Ai, X.
Aielli, G.
Akatsuka, S.
Akbiyik, M.
Akesson, T. P. A.
Akilli, E.
Akimov, A., V
Al Khoury, K.
Alberghi, G. L.
Albert, J.
Verzini, M. J. Alconada
Alderweireldt, S.
Aleksa, M.
Aleksandrov, I. N.
Alexa, C.
Alexopoulos, T.
Alfonsi, A.
Alfonsi, F.
EUROPEAN PHYSICAL JOURNAL C, 2021, 81 (05):

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