Measurement of the polarisation of single top quarks and antiquarks produced in the t-channel at √s=13 TeV and bounds on the tWb dipole operator from the ATLAS experiment

被引：0

作者：

Aad, G. ^{[156
]}

Abbott, B. ^{[185
]}

Abbott, D. C. ^{[157
]}

Abud, A. Abed ^{[59
]}

Abeling, K. ^{[80
]}

Abhayasinghe, D. K. ^{[147
]}

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

Abramowicz, H. ^{[228
]}

Abreu, H. ^{[227
]}

Abulaiti, Y. ^{[7
]}

Abusleme Hoffman, A. C. ^{[209
]}

Acharya, B. S. ^{[103
,104
,264
]}

Achkar, B. ^{[80
]}

Adam, L. ^{[154
]}

Bourdarios, C. Adam ^{[6
]}

Adamczyk, L. ^{[133
]}

Adamek, L. ^{[234
]}

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

Adelman, J. ^{[176
]}

Adiguzel, A. ^{[15
,278
]}

Adorni, S. ^{[81
]}

Adye, T. ^{[206
]}

Affolder, A. A. ^{[208
]}

Afik, Y. ^{[227
]}

Agapopoulou, C. ^{[101
]}

Agaras, M. N. ^{[17
]}

Agarwala, J. ^{[112
,113
]}

Aggarwal, A. ^{[173
]}

Agheorghiesei, C. ^{[40
]}

Aguilar-Saavedra, J. A. ^{[196
,201
,277
]}

Ahmad, A. ^{[59
]}

Ahmadov, F. ^{[127
,275
]}

Ahmed, W. S. ^{[158
]}

Ai, X. ^{[71
,72
]}

Aielli, G. ^{[118
,119
]}

Aizenberg, I ^{[249
]}

Akatsuka, S. ^{[136
]}

Akbiyik, M. ^{[154
]}

Akesson, T. P. A. ^{[150
]}

Akimov, A., V ^{[165
]}

Al Khoury, K. ^{[62
]}

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

Albert, J. ^{[245
]}

Albicocco, P. ^{[77
,78
]}

Alconada Verzini, M. J. ^{[140
,141
]}

Alderweireldt, S. ^{[76
]}

Aleksa, M. ^{[59
]}

Aleksandrov, I. N. ^{[127
]}

Alexa, C. ^{[39
]}

Alexopoulos, T. ^{[11
]}

机构：

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

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

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

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

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

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

[7] Argonne Natl Lab, High Energy Phys Div, Argonne, IL 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, Phys Dept, Athens, Greece

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

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

[13] Bahcesehir Univ, Fac Engn & Nat Sci, Istanbul, Turkey

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[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] Ist Nazl Fis Nucl, 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, Phys Dept, 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, Dept Subnucl Phys, Inst Expt 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 Long Beach, Long Beach, CA 90840 USA

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

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2022年 / 11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; 欧盟地平线“2020”;

关键词：

Hadron-Hadron Scattering; Top Physics; PARTON DISTRIBUTIONS; PAIR PRODUCTION; PLUS PLUS; LHC; JETS; DECAY;

D O I：

10.1007/JHEP11(2022)040

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 simultaneous measurement of the three components of the top-quark and top-antiquark polarisation vectors in t-channel single-top-quark production is presented. This analysis is based on data from proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 139 fb(-1), collected with the ATLAS detector at the LHC. Selected events contain exactly one isolated electron or muon, large missing transverse momentum and exactly two jets, one being b-tagged. Stringent selection requirements are applied to discriminate t-channel single-top-quark events from the background contributions. The top-quark and top-antiquark polarisation vectors are measured from the distributions of the direction cosines of the charged-lepton momentum in the top-quark rest frame. The three components of the polarisation vector for the selected top-quark event sample are P-x' = 0.01 +/- 0.18, P-y' = -0.029 +/- 0.027, P-z' = 0.91 +/- 0.10 and for the top-antiquark event sample they are P-x' = -0.02 +/- 0.20, P-y' = -0.007 +/- 0.051, P-z' = -0.79 +/- 0.16. Normalised differential cross-sections corrected to a fiducial region at the stable-particle level are presented as a function of the charged-lepton angles for top-quark and top-antiquark events inclusively and separately. These measurements are in agreement with Standard Model predictions. The angular differential cross-sections are used to derive bounds on the complex Wilson coefficient of the dimension-six O-tW operator in the framework of an effective field theory. The obtained bounds are C-tW is an element of[-0.9, 1.4] and C-itW is an element of [-0.8, 0.2], both at 95% confidence level.

引用

页数：62

共 39 条

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Y. Abulaiti
B. S. Acharya
S. Adachi
L. Adamczyk
J. Adelman
M. Adersberger
T. Adye
A. A. Affolder
Y. Afik
C. Agheorghiesei
J. A. Aguilar-Saavedra
S. P. Ahlen
F. Ahmadov
G. Aielli
S. Akatsuka
H. Akerstedt
T. P. A. Åkesson
E. Akilli
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G. L. Alberghi
J. Albert
P. Albicocco
M. J. Alconada Verzini
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M. Aleksa
I. N. Aleksandrov
C. Alexa
G. Alexander
T. Alexopoulos
M. Alhroob
B. Ali
M. Aliev
G. Alimonti
J. Alison
S. P. Alkire
B. M. M. Allbrooke
B. W. Allen
P. P. Allport
A. Aloisio
A. Alonso
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