Observation of Spin Correlation in t(t)over-bar Events from pp Collisions at √s=7 TeV Using the ATLAS Detector

被引：195

作者：

Aad, G. ^{[1
]}

Abbott, B. ^{[148
]}

Abdallah, J. ^{[16
,17
,18
]}

Khalek, S. Abdel ^{[152
,153
]}

Abdelalim, A. A. ^{[71
]}

Abdesselam, A. ^{[156
]}

Abdinov, O. ^{[15
]}

Abi, B. ^{[149
]}

Abolins, M. ^{[122
]}

AbouZeid, O. S. ^{[213
]}

Abramowicz, H. ^{[207
]}

Abreu, H. ^{[152
,153
]}

Acerbi, E. ^{[123
,124
]}

Acharya, B. S. ^{[220
,221
]}

Adamczyk, L. ^{[60
]}

Adams, D. L. ^{[39
]}

Addy, T. N. ^{[82
]}

Adelman, J. ^{[237
]}

Aderholz, M. ^{[134
]}

Adomeit, S. ^{[133
]}

Adragna, P. ^{[106
]}

Adye, T. ^{[171
]}

Aefsky, S. ^{[34
]}

Aguilar-Saavedra, J. A. ^{[164
,165
,166
]}

Aharrouche, M. ^{[114
]}

Ahlen, S. P. ^{[33
]}

Ahles, F. ^{[1
]}

Ahmad, A. ^{[201
,202
]}

Ahsan, M. ^{[63
]}

Aielli, G. ^{[176
,177
]}

Akdogan, T. ^{[27
]}

Akesson, T. P. A. ^{[112
]}

Akimoto, G. ^{[209
,210
]}

Akimov, A. V. ^{[129
]}

Akiyama, A. ^{[95
]}

Alam, M. S. ^{[2
]}

Alam, M. A. ^{[107
]}

Albert, J. ^{[231
]}

Albrand, S. ^{[79
,80
,81
]}

Aleksa, M. ^{[45
]}

Aleksandrov, I. N. ^{[93
]}

Alessandria, F. ^{[123
]}

Alexa, C. ^{[40
]}

Alexander, G. ^{[207
]}

Alexandre, G. ^{[71
]}

Alexopoulos, T. ^{[14
]}

Alhroob, M. ^{[32
]}

Aliev, M. ^{[23
]}

Alimonti, G. ^{[123
]}

Alison, J. ^{[159
]}

机构：

[1] Univ Freiburg, Fak Math & Phys, Hugstetter Str 55, D-79106 Freiburg, Germany

[2] SUNY Albany, Albany, NY 12222 USA

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

[4] Ankara Univ, Dept Phys, TR-06100 Ankara, Turkey

[5] Gazi Univ, Dept Phys, Ankara, Turkey

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

[7] Turkish Atom Energy Commiss, Ankara, Turkey

[8] Univ Savoie, Annecy Le Vieux, France

[9] CNRS IN2P3, LAPP, Annecy Le Vieux, France

[10] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA

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

[12] Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA

[13] Univ Athens, Dept Phys, Athens, Greece

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

[15] Azerbaijan Acad Sci, Inst Phys, Baku 370143, Azerbaijan

[16] ICREA, Barcelona, Spain

[17] Univ Autonoma Barcelona, Dept Fis, E-08193 Barcelona, Spain

[18] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain

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

[20] Univ Belgrade, Vinca Inst Nucl Sci, Belgrade, Serbia

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

[22] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA

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

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

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

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

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

[28] Dogus Univ, Div Phys, Istanbul, Turkey

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

[30] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy

[31] Univ Bologna, Dipartimento Fis, Bologna, Italy

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

[33] Boston Univ, Dept Phys, Boston, MA 02215 USA

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

[35] Univ Fed Rio De Janeiro COPPE EE IF, Rio De Janeiro, Brazil

[36] Fed Univ Juiz De Fora UFJF, Juiz De Fora, Brazil

[37] Fed Univ Sao Joao Del Rei UFSJ, Sao Joao Del Rei, Brazil

[38] Univ Sao Paulo, Inst Fis, BR-01498 Sao Paulo, Brazil

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

[40] Natl Inst Phys & Nucl Engn, Bucharest, Romania

[41] Univ Politehn Bucuresti, Bucharest, Romania

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

[43] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[44] Carleton Univ, Dept Phys, Ottawa, ON K1S 5B6, Canada

[45] CERN, Geneva, Switzerland

[46] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[47] Pontificia Univ Catolica Chile, Dept Fis, Santiago, Chile

[48] Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile

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

[50] Univ Sci & Technol China, Dept Modern Phys, Hefei, Anhui, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 21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; 美国国家科学基金会;

关键词：

QUARK-PAIR PRODUCTION; TOP-QUARK; DECAY; DISTRIBUTIONS; POLARIZATION; TEVATRON;

D O I：

10.1103/PhysRevLett.108.212001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A measurement of spin correlation in t (t) over bar production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1 fb(-1). Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons in the laboratory frame is used to extract the correlation between the top and antitop quark spins. In the helicity basis the measured degree of correlation corresponds to A(helicity) = 0.40(-0.08)(+0.09), in agreement with the next-to-leading-order standard model prediction. The hypothesis of zero spin correlation is excluded at 5.1 standard deviations.

引用

页数：19

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