Measurements of top-quark pair spin correlations in the eμ channel at <mml:msqrt>s</mml:msqrt>=13 TeV using pp collisions in the ATLAS detector

被引：0

作者：

Aaboud, M. ^{[58
,59
]}

Aad, G. ^{[160
]}

Abbott, B. ^{[191
]}

Abbott, D. C. ^{[161
]}

Abdinov, O. ^{[18
]}

Abud, A. Abed ^{[115
,116
]}

Abhayasinghe, D. K. ^{[151
]}

Abidi, S. H. ^{[238
]}

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

Abraham, N. L. ^{[225
]}

Abramowicz, H. ^{[231
]}

Abreu, H. ^{[230
]}

Abulaiti, Y. ^{[8
]}

Acharya, B. S. ^{[106
,107
,270
]}

Adachi, S. ^{[233
,234
]}

Adam, L. ^{[158
]}

Bourdarios, C. Adam ^{[104
]}

Adamczyk, L. ^{[137
]}

Adamek, L. ^{[238
]}

Adelman, J. ^{[181
]}

Adersberger, M. ^{[172
]}

Adiguzel, A. ^{[16
,284
]}

Adorni, S. ^{[83
]}

Adye, T. ^{[211
]}

Affolder, A. A. ^{[213
]}

Afik, Y. ^{[230
]}

Agapopoulou, C. ^{[104
]}

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

Aggarwal, A. ^{[178
]}

Agheorghiesei, C. ^{[42
]}

Aguilar-Saavedra, J. A. ^{[202
,207
,283
]}

Ahmadov, F. ^{[130
]}

Ai, X. ^{[20
]}

Aielli, G. ^{[121
,122
]}

Akatsuka, S. ^{[140
]}

Akesson, T. P. A. ^{[154
]}

Akilli, E. ^{[83
]}

Akimov, A., V ^{[169
]}

Al Khoury, K. ^{[104
]}

Alberghi, G. L. ^{[34
,35
,36
]}

Albert, J. ^{[249
]}

Verzini, M. J. Alconada ^{[231
]}

Alderweireldt, S. ^{[178
]}

Aleksa, M. ^{[61
]}

Aleksandrov, I. N. ^{[130
]}

Alexa, C. ^{[41
]}

Alexandre, D. ^{[28
]}

Alexopoulos, T. ^{[12
]}

Alfonsi, A. ^{[179
,180
]}

Alhroob, M. ^{[191
]}

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, Univ Grenoble Alpes, LAPP, CNRS IN2P3, Annecy, France

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

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

[10] Univ Texas Arlington, Dept Phys, Arlington, TX 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] INFN Bologna, Dipartimento Fis, Bologna, Italy

[35] Univ Bologna, Bologna, Italy

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

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

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

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

[40] Transilvania Univ Brasov, Brasov, Romania

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

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

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

[44] West Univ Timisoara, Timisoara, Romania

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

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

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

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

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

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

来源：

EUROPEAN PHYSICAL JOURNAL C | 2020年 / 80卷 / 08期

基金：

欧盟地平线“2020”; 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：

LEPTON SPECTRA; TEVATRON; DECAY;

D O I：

10.1140/epjc/s10052-020-8181-6

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 observables sensitive to spin correlations in tt<overbar></mml:mover> production is presented, using 36.1 fb-1 of pp collision data at <mml:msqrt>s</mml:msqrt>=13 TeV recorded with the ATLAS detector at the Large Hadron Collider. Differential cross-sections are measured in events with exactly one electron and one muon with opposite-sign electric charge as a function of the azimuthal opening angle and the absolute difference in pseudorapidity between the electron and muon candidates in the laboratory frame. The azimuthal opening angle is also measured as a function of the invariant mass of the t<mml:mover accent="true">t<mml:mo stretchy="false"><overbar></mml:mover> system. The measured differential cross-sections are compared to predictions by several NLO Monte Carlo generators and fixed-order calculations. The observed degree of spin correlation is somewhat higher than predicted by the generators used. The data are consistent with the prediction of one of the fixed-order calculations at NLO, but agree less well with higher-order predictions. Using these leptonic observables, a search is performed for pair production of supersymmetric top squarks decaying into Standard Model top quarks and light neutralinos. Top squark masses between 170 and 230 GeV are largely excluded at the 95% confidence level for kinematically allowed values of the neutralino mass.

引用

页数：43

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