Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s=8 TeV Using the ATLAS Detector

被引：68

作者：

Aad, G. ^{[121
]}

Abbott, B. ^{[154
]}

Abdallah, J. ^{[215
]}

Khalek, S. Abdel ^{[158
,159
]}

Abdinov, O. ^{[15
]}

Aben, R. ^{[147
,148
]}

Abi, B. ^{[155
]}

Abolins, M. ^{[127
]}

AbouZeid, O. S. ^{[223
]}

Abramowicz, H. ^{[217
]}

Abreu, H. ^{[45
,216
]}

Abreu, R. ^{[45
]}

Abulaiti, Y. ^{[208
,209
]}

Acharya, B. S. ^{[230
,231
,251
]}

Adamczyk, L. ^{[62
]}

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

Adelman, J. ^{[149
]}

Adomeit, S. ^{[138
]}

Adye, T. ^{[181
]}

Agatonovic-Jovin, T. ^{[18
]}

Aguilar-Saavedra, J. A. ^{[170
,175
,176
]}

Agustoni, M. ^{[24
,25
]}

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

Ahmadov, F. ^{[96
]}

Aielli, G. ^{[185
,186
]}

Akerstedt, H. ^{[208
,209
]}

Akesson, T. P. A. ^{[117
]}

Akimoto, G. ^{[219
,220
]}

Akimov, A. V. ^{[134
]}

Alberghi, G. L. ^{[30
,31
]}

Albert, J. ^{[241
]}

Albrand, S. ^{[83
]}

Alconada Verzini, M. J. ^{[102
,103
]}

Aleksa, M. ^{[45
]}

Aleksandrov, I. N. ^{[96
]}

Alexa, C. ^{[40
]}

Alexander, G. ^{[75
,217
]}

Alexandre, G. ^{[75
]}

Alexopoulos, T. ^{[14
]}

Alhroob, M. ^{[154
]}

Alimonti, G. ^{[128
]}

Alio, L. ^{[121
,122
]}

Alison, J. ^{[46
]}

Allbrooke, B. M. M. ^{[26
]}

Allison, L. J. ^{[104
]}

Allport, P. P. ^{[107
]}

Aloisio, A. ^{[77
,142
,144
]}

Alonso, A. ^{[59
]}

Alonso, F. ^{[102
,103
]}

Alpigiani, C. ^{[110
]}

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, TR-06100 Ankara, Turkey

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

[6] Istanbul Aydin Univ, Istanbul, Turkey

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

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

[9] Univ Savoie, Annecy Le Vieux, France

[10] Argonne Natl Lab, High Energy Phys Div, 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, GR-15773 Zografos, Greece

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

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

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

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

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

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

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

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

[23] Humboldt Univ, Dept Phys, D-10099 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, W Midlands, England

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

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

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

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

[31] Univ Bologna, Dipartimento Fis & Astron, 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, Elect Circuits Dept, 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] Natl Inst Res & Dev Isotop & Mol Technol, Dept Phys, Cluj Napoca, 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 Phys, 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 | 2015年 / 114卷 / 14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：

SYMMETRY-BREAKING; PLUS PLUS; DECAY; POLARIZATION; SUPERSYMMETRY; DISTRIBUTIONS; COUPLINGS; TEVATRON; LEPTONS; WEAK;

D O I：

10.1103/PhysRevLett.114.142001

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 presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb(-1). The correlation between the top and antitop quark spins is extracted from dilepton t (t) over bar events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to A(helicity) = 0.38 +/- 0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.

引用

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