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：

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

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

共 50 条

[1] Top polarization and exploration of t(t)over-bar forward-backward asymmetry
Saha, Pratishruti
[J]. PRAMANA-JOURNAL OF PHYSICS, 2012, 79 (05): : 1297 - 1300
[2] Transverse top quark polarization and the t(t)over-bar forward-backward asymmetry
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[J]. JOURNAL OF HIGH ENERGY PHYSICS, 2013, (08):
[3] Forward-backward asymmetry in t(t)over-bar production
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[J]. NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS, 2012, 35 (01): : 327 - 332
[4] Four top quarks and the t(t)over-bar forward-backward asymmetry
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Santiago, J.
[J]. PHYSICAL REVIEW D, 2012, 85 (03):
[5] Forward-Backward Asymmetry in t(t)over-bar Production from Flavor Symmetries
Grinstein, Benjamin
Kagan, Alexander L.
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[J]. PHYSICAL REVIEW LETTERS, 2011, 107 (01)
[6] Forward-backward t(t)over-bar asymmetry from anomalous stop pair production
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[J]. PHYSICS LETTERS B, 2011, 700 (02) : 145 - 149
[7] Implications of the CDF t(t)over-bar forward-backward asymmetry for hard top physics
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[J]. JOURNAL OF HIGH ENERGY PHYSICS, 2011, (08):
[8] Implications of the CDF t(t)over-bar forward-backward asymmetry for boosted top physics
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[J]. PHYSICS LETTERS B, 2011, 702 (05) : 364 - 369
[9] Scalar-mediated t(t)over-bar forward-backward asymmetry
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[J]. JOURNAL OF HIGH ENERGY PHYSICS, 2011, (10):
[10] Measurement of the forward-backward asymmetry of Λ and (Λ)over-bar production in p(p)over-bar collisions
Abazov, V. M.
Abbott, B.
Acharya, B. S.
Adams, M.
Adams, T.
Agnew, J. P.
Alexeev, G. D.
Alkhazov, G.
Alton, A.
Askew, A.
Atkins, S.
Augsten, K.
Avila, C.
Badaud, F.
Bagby, L.
Baldin, B.
Bandurin, D. V.
Banerjee, S.
Barberis, E.
Baringer, P.
Bartlett, J. F.
Bassler, U.
Bazterra, V.
Bean, A.
Begalli, M.
Bellantoni, L.
Beri, S. B.
Bernardi, G.
Bernhard, R.
Bertram, I.
Besancon, M.
Beuselinck, R.
Bhat, P. C.
Bhatia, S.
Bhatnagar, V.
Blazey, G.
Blessing, S.
Bloom, K.
Boehnlein, A.
Boline, D.
Boos, E. E.
Borissov, G.
Borysova, M.
Brandt, A.
Brandt, O.
Brock, R.
Bross, A.
Brown, D.
Bu, X. B.
Buehler, M.
[J]. PHYSICAL REVIEW D, 2016, 93 (03)

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