Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from t(t)over-bar production at the Tevatron

被引：21

作者：

Abazov, V. M. ^{[33
]}

Abbott, B. ^{[70
]}

Acharya, B. S. ^{[27
]}

Adams, M. ^{[49
]}

Adams, T. ^{[47
]}

Agnew, J. P. ^{[44
]}

Alexeev, G. D. ^{[33
]}

Alkhazov, G. ^{[37
]}

Alton, A. ^{[59
]}

Askew, A. ^{[47
]}

Atkins, S. ^{[57
]}

Augsten, K. ^{[7
]}

Avila, C. ^{[5
]}

Badaud, F. ^{[10
]}

Bagby, L. ^{[48
]}

Baldin, B. ^{[48
]}

Bandurin, D. V. ^{[76
]}

Banerjee, S. ^{[27
]}

Barberis, E. ^{[58
]}

Baringer, P. ^{[56
]}

Bartlett, J. F. ^{[48
]}

Bassler, U. ^{[16
]}

Bazterra, V. ^{[49
]}

Bean, A. ^{[56
]}

Begalli, M. ^{[2
]}

Bellantoni, L. ^{[48
]}

Beri, S. B. ^{[25
]}

Bernardi, G. ^{[14
,15
]}

Bernhard, R. ^{[21
]}

Bertram, I. ^{[42
]}

Besancon, M.

Beuselinck, R. ^{[43
]}

Bhat, P. C. ^{[48
]}

Bhatia, S. ^{[61
]}

Bhatnagar, V. ^{[25
]}

Blazey, G. ^{[50
]}

Blessing, S. ^{[47
]}

Bloom, K. ^{[62
]}

Boehnlein, A. ^{[48
]}

Boline, D. ^{[67
]}

Boos, E. E. ^{[35
]}

Borissov, G. ^{[42
]}

Borysova, M. ^{[41
]}

Brandt, A. ^{[73
]}

Brandt, O. ^{[22
]}

Brock, R. ^{[60
]}

Bross, A. ^{[48
]}

Brown, D. ^{[14
,15
]}

Bu, X. B. ^{[48
]}

Buehler, M. ^{[48
]}

机构：

[1] Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil

[2] Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil

[3] Univ Fed ABC, Santo Andre, Brazil

[4] Univ Sci & Technol China, Hefei 230026, Peoples R China

[5] Univ Los Andes, Bogota, Colombia

[6] Charles Univ Prague, Fac Math & Phys, Ctr Particle Phys, Prague, Czech Republic

[7] Czech Tech Univ, CR-16635 Prague, Czech Republic

[8] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic

[9] Univ San Francisco Quito, Quito, Ecuador

[10] Univ Blaise Pascal, LPC, CNRS, IN2P3, Clermont, France

[11] Univ Grenoble 1, CNRS, IN2P3, LPSC,Inst Natl Polytech Grenoble, Grenoble, France

[12] Aix Marseille Univ, CPPM, CNRS, IN2P3, Marseille, France

[13] Univ Paris Sud, LAL, CNRS, IN2P3, Orsay, France

[14] Univ Paris 06, CNRS, IN2P3, LPNHE, Paris, France

[15] Univ Paris 07, CNRS, IN2P3, LPNHE, Paris, France

[16] SPP, Irfu, CEA, Saclay, France

[17] Univ Strasbourg, IPHC, CNRS, IN2P3, Strasbourg, France

[18] Univ Lyon 1, CNRS, IPNL, IN2P3, F-69622 Villeurbanne, France

[19] Univ Lyon, Lyon, France

[20] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany

[21] Univ Freiburg, Inst Phys, D-79106 Freiburg, Germany

[22] Univ Gottingen, Inst Phys 2, Gottingen, Germany

[23] Johannes Gutenberg Univ Mainz, Inst Phys, Mainz, Germany

[24] Univ Munich, Munich, Germany

[25] Panjab Univ, Chandigarh 160014, India

[26] Univ Delhi, Delhi 110007, India

[27] Tata Inst Fundamental Res, Mumbai 400005, Maharashtra, India

[28] Univ Coll Dublin, Dublin 2, Ireland

[29] Korea Univ, Korea Detector Lab, Seoul, South Korea

[30] CINVESTAV, Mexico City 14000, DF, Mexico

[31] Nikhef, Amsterdam, Netherlands

[32] Radboud Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands

[33] Joint Nucl Res Inst, Dubna, Russia

[34] Inst Theoret & Expt Phys, Moscow 117259, Russia

[35] Moscow MV Lomonosov State Univ, Moscow, Russia

[36] Inst High Energy Phys, Protvino, Russia

[37] Petersburg Nucl Phys Inst, St Petersburg, Russia

[38] ICREA, Barcelona, Spain

[39] IFAE, Barcelona, Spain

[40] Uppsala Univ, Uppsala, Sweden

[41] Taras Shevchenko Natl Univ Kyiv, Kiev, Ukraine

[42] Univ Lancaster, Lancaster LA1 4YB, England

[43] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England

[44] Univ Manchester, Manchester M13 9PL, Lancs, England

[45] Univ Arizona, Tucson, AZ 85721 USA

[46] Univ Calif Riverside, Riverside, CA 92521 USA

[47] Florida State Univ, Tallahassee, FL 32306 USA

[48] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[49] Univ Illinois, Chicago, IL 60607 USA

[50] No Illinois Univ, De Kalb, IL 60115 USA

来源：

PHYSICAL REVIEW D | 2015年 / 92卷 / 05期

基金：

俄罗斯基础研究基金会; 美国国家科学基金会; 瑞典研究理事会; 新加坡国家研究基金会; 英国科学技术设施理事会; 中国国家自然科学基金; 爱尔兰科学基金会;

关键词：

IDENTIFICATION;

D O I：

10.1103/PhysRevD.92.052007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in t (t) over bar production in dilepton final states using 9.7 fb(-1) of proton-antiproton collisions at root s = 1.96 TeV with the D0 detector. To reconstruct the distributions of kinematic observables we employ a matrix element technique that calculates the likelihood of the possible t (t) over bar kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of A(t (t) over bar) = (15.0 +/- 6.4(stat) +/- 4.9(syst)) % and a top-quark polarization times spin analyzing power in the beam basis of kappa P = (7.2 +/- 10.5(stat) +/- 4.2(syst)) %, with a correlation of -56% between the measurements. If we constrain the forward-backward asymmetry to its expected standard model value, we obtain a measurement of the top polarization of kappa P = (11.3 +/- 9.1(stat) +/- 1.9(syst)) %. If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of A(t (t) over bar) = (17.5 +/- 5.6(stat) +/- 3.1(syst)) %. A combination with the D0 A(t (t) over bar) measurement in the lepton + jets final state yields an asymmetry of A(t (t) over bar) = (11.8 +/- 2.5(stat) +/- 1.3(syst)) %. Within their respective uncertainties, all these results are consistent with the standard model expectations.

引用

页数：16

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