Measurement of the polarisation of Wbosons produced in top-quark decays using dilepton events at √s=13TeV with the ATLAS experiment

被引：2

作者：

Aad, G. ^{[161
]}

Abbott, B. ^{[181
]}

Abbott, D. C. ^{[162
]}

Abeling, K. ^{[84
]}

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

Aboulhormae, A. ^{[61
]}

Abramowicz, H. ^{[225
]}

Abreu, H. ^{[224
]}

Abulaiti, Y. ^{[178
]}

Abusleme Hoffmana, A. C. ^{[204
]}

Acharyaa, B. S. ^{[109
,110
,264
]}

Bourdarios, C. Adam ^{[5
]}

Adamczyka, L. ^{[139
]}

Adamek, L. ^{[230
]}

Addepalli, S. V. ^{[36
]}

Adelman, J. ^{[176
]}

Adiguzelc, A.

Adorni, S. ^{[85
]}

Adye, T. ^{[201
]}

Affolder, A. A. ^{[203
]}

Afik, Y. ^{[62
]}

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

Agarwalaa, J. ^{[118
,119
]}

Aggarwal, A. ^{[159
]}

Agheorghieseic, C. ^{[39
]}

Aguilar-Saavedraf, J. A. ^{[196
]}

Ahmad, A. ^{[62
]}

Ahmadov, F. ^{[64
,274
]}

Ahmed, W. S. ^{[163
]}

Ahuja, S. ^{[153
]}

Ai, X. ^{[76
,77
]}

Aiellia, G. ^{[124
,125
]}

Tamlihate, M. Ait ^{[61
]}

Aitbenchikh, B. ^{[58
]}

Aizenberg, I. ^{[246
]}

Akbiyik, M. ^{[159
]}

Akesson, T. P. A. ^{[156
]}

Akimov, A. V. ^{[63
]}

Al Khoury, K. ^{[67
]}

Alberghib, G. L. ^{[33
]}

Albert, J. ^{[242
]}

Albicocco, P. ^{[82
]}

Alderweireldt, S. ^{[81
]}

Aleksa, M. ^{[62
]}

Aleksandrov, I. N. ^{[64
]}

Alexab, C. ^{[38
]}

Alexopoulos, T. ^{[11
]}

Alfonsi, A. ^{[174
,175
]}

Alfonsib, F. ^{[33
]}

Alhroob, M. ^{[181
]}

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, Argonne, IL USA

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

[9] Univ Texas Arlington, Dept Phys, Arlington, TX USA

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

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

[12] Univ Texas, Dept Phys, Austin, TX 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] Univ Calif Berkeley, Berkeley, CA USA

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

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

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

[26] Univ Birmingham, Sch Phys & Astron, Birmingham, AL USA

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

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

[29] Istinye Univ, Istanbul, Turkiye

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

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

[32] Univ Bologna, Dipartimento Fis Astron A Righi, Bologna, Italy

[33] INFN, Sez Bologna Italy, Bologna, Italy

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

[35] Boston Univ, Dept Phys, Boston, MA USA

[36] Brandeis Univ, Dept Phys, Waltham, MA USA

[37] Transilvania Univ Brasov, Brasov, Romania

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

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

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

[41] Univ Politehn Bucuresti, Bucharest, Romania

[42] West Univ Timisoara, Timisoara, Romania

[43] Univ Bucharest, Fac Phys, Bucharest, 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 USA

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

[48] Consejo Nacl Invest Cient & Tecn, Inst Fis Buenos Aires IFIBA, Buenos Aires, DF, Argentina

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

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

来源：

PHYSICS LETTERS B | 2023年 / 843卷

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; 欧盟地平线“2020”;

关键词：

PAIR PRODUCTION; PLUS PLUS;

D O I：

10.1016/j.physletb.2023.137829

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A measurement of the polarisation of Wbosons produced in top-quark decays is presented, using proton-proton collision data at a centre-of-mass energy of v s= 13TeV. The data were collected by the ATLAS detector at the Large Hadron Collider and correspond to an integrated luminosity of 139fb(-1). The measurement is performed selecting t tevents decaying into final states with two charged leptons (electrons or muons) and at least two b-tagged jets. The polarisation is extracted from the differential cross-section distribution of the cos theta* variable, where theta(*) is the angle between the momentum direction of the charged lepton from the Wboson decay and the reversed momentum direction of the b-quark from the top-quark decay, both calculated in the Wboson rest frame. Parton-level results, corrected for the detector acceptance and resolution, are presented for the cos theta* angle. The measured fractions of longitudinal, left- and right-handed polarisation states are found to be f(0) = 0.684 +/- 0.005 (stat.)+/- 0.014 (syst.), f(L)= 0.318 +/- 0.003 (stat.)+/- 0.008 (syst.) and f(R)=-0.002 +/- 0.002 (stat.)+/- 0.014 (syst.), in agreement with the Standard Model prediction. (c) 2023 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 SCOAP(3).

引用

页数：22

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