Measurement of the energy asymmetry in t(t)over-barj production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework

被引：0

作者：

Aad, G. ^{[155
]}

Abbott, B. ^{[185
]}

Abbott, D. C. ^{[156
]}

Abud, A. Abed ^{[59
]}

Abeling, K. ^{[80
]}

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

Abidi, S. H. ^{[44
]}

Aboulhorma, A. ^{[58
]}

Abramowicz, H. ^{[230
]}

Abreu, H. ^{[229
]}

Abulaiti, Y. ^{[6
]}

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

Acharya, B. S. ^{[103
,104
,268
]}

Achkar, B. ^{[80
]}

Adam, L. ^{[153
]}

Bourdarios, C. Adam ^{[5
]}

Adamczyk, L. ^{[133
]}

Adamek, L. ^{[236
]}

Addepalli, S., V ^{[35
]}

Adelman, J. ^{[175
]}

Adiguzel, A. ^{[13
,280
]}

Adorni, S. ^{[81
]}

Adye, T. ^{[206
]}

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

Afik, Y. ^{[59
]}

Agapopoulou, C. ^{[101
]}

Agaras, M. N. ^{[15
]}

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

Aggarwal, A. ^{[172
]}

Agheorghiesei, C.

Aguilar-Saavedra, J. A. ^{[196
,201
,279
]}

Ahmad, A. ^{[59
]}

Ahmadov, F. ^{[127
]}

Ahmed, W. S. ^{[157
]}

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

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

Aizenberg, I ^{[251
]}

Akatsuka, S. ^{[136
]}

Akbiyik, M. ^{[153
]}

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

Akimov, A., V ^{[164
]}

Al Khoury, K. ^{[62
]}

Alberghi, G. L. ^{[32
]}

Albert, J. ^{[247
]}

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

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

Alderweireldt, S. ^{[76
]}

Aleksa, M. ^{[59
]}

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

Alexa, C. ^{[37
]}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[36] Transilvania Univ Brasov, Brasov, Romania

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

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

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

[40] Univ Politehn Bucuresti, Bucharest, Romania

[41] West Univ Timisoara, Timisoara, Romania

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

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

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

[45] Univ Buenos Aires, Dept Fis FCEN, Buenos Aires, DF, Argentina

[46] Univ Buenos Aires, IFIBA, Buenos Aires, DF, Argentina

[47] Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF, Argentina

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

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

[50] Univ Cape Town, Dept Phys, Cape Town, South Africa

来源：

EUROPEAN PHYSICAL JOURNAL C | 2022年 / 82卷 / 04期

基金：

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

关键词：

QUARK PAIR PRODUCTION; PARTON DISTRIBUTIONS; PLUS PLUS;

D O I：

10.1140/epjc/s10052-022-10101-w

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 measurement of the energy asymmetry in jet-associated top-quark pair production is presented using 139 fb(-1) of data collected by the ATLAS detector at the Large Hadron Collider during pp collisions at root s = 13 TeV. The observable measures the different probability of top and antitop quarks to have the higher energy as a function of the jet scattering angle with respect to the beam axis. The energy asymmetry is measured in the semileptonic t (t) over bar decay channel, and the hadronically decaying top quark must have transverse momentum above 350 GeV. The results are corrected for detector effects to particle level in three bins of the scattering angle of the associated jet. The measurement agrees with the SM prediction at next-to-leading-order accuracy in quantum chromodynamics in all three bins. In the bin with the largest expected asymmetry, where the jet is emitted perpendicular to the beam, the energy asymmetry is measured to be -0.043 +/- 0.020, in agreement with the SM prediction of -0.037 +/- 0.003. Interpreting this result in the framework of the Standard Model effective field theory (SMEFT), it is shown that the energy asymmetry is sensitive to the top-quark chirality in four-quark operators and is therefore a valuable new observable in global SMEFT fits.

引用

页数：36

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