Model-independent measurement of the W-boson helicity in top-quark decays at D0

被引:37
作者
Abazov, V. M. [43 ]
Abbott, B. [86 ]
Abolins, M. [76 ]
Acharya, B. S. [35 ]
Adams, M. [62 ]
Adams, T. [60 ]
Aguilo, E. [6 ,7 ,8 ,9 ]
Ahn, S. H. [37 ]
Ahsan, M. [70 ]
Alexeev, G. D. [43 ]
Alkhazov, G. [47 ]
Alton, A. [75 ]
Alverson, G. [74 ]
Alves, G. A. [2 ]
Anastasoaie, M. [42 ]
Ancu, L. S. [42 ]
Andeen, T. [64 ]
Anderson, S. [56 ]
Andrieu, B. [20 ,21 ]
Anzelc, M. S. [64 ]
Amoud, Y. [17 ]
Arov, M. [71 ]
Arthaud, M. [22 ]
Askew, A. [60 ]
Asman, B. [48 ,49 ,50 ,51 ]
Jesus, A. C. S. Assis [3 ]
Atramentov, O. [60 ]
Autermann, C. [27 ]
Avila, C. [11 ]
Ay, C. [30 ]
Badaud, F. [16 ]
Baden, A. [72 ]
Bagby, L. [63 ]
Baldin, B. [61 ]
Bandurin, D. V. [70 ]
Banerjee, S. [35 ]
Banerjee, P. [35 ]
Barberis, E. [33 ,74 ]
Barfuss, A. -F. [18 ]
Bargassa, P. [91 ]
Baringer, P. [69 ]
Barreto, J. [2 ]
Bartlett, J. F. [61 ]
Bassler, U. [22 ]
Bauer, D. [54 ]
Beale, S. [6 ,7 ,8 ,9 ]
Bean, A. [69 ]
Begalli, M. [3 ]
Begel, M. [82 ]
Belanger-Champagne, C. [48 ,49 ,50 ,51 ]
机构
[1] Univ Buenos Aires, Buenos Aires, DF, Argentina
[2] Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil
[3] Univ Estado Rio de Janiero, Rio De Janeiro, Brazil
[4] Univ Fed ABC, Santo Andre, Brazil
[5] Univ Estadual Paulista, Inst Fis Teor, BR-01405 Sao Paulo, Brazil
[6] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada
[7] Univ Alberta, Edmonton, AB, Canada
[8] York Univ, Toronto, ON M3J 2R7, Canada
[9] McGill Univ, Montreal, PQ, Canada
[10] Univ Sci & Technol China, Hefei, Peoples R China
[11] Univ Los Andes, Bogota, Colombia
[12] Charles Univ Prague, Ctr Particle Phys, Prague, Czech Republic
[13] Czech Tech Univ, CR-16635 Prague, Czech Republic
[14] Acad Sci Czech Republic, Inst Phys, Ctr Particle Phys, Prague, Czech Republic
[15] Univ San Francisco Quito, Quito, Ecuador
[16] Univ Blaise Pascal, LPC, CNRS, IN2P3, Clermont, France
[17] Univ Grenoble 1, LPSC, CNRS, IN2P3,Inst Natl Polytech Grenoblt, F-38041 Grenoble, France
[18] Univ Aix Marseille 2, CNRS, IN2P3, CPPM, Marseille, France
[19] Univ Paris 11, CNRS, IN2P3, LAL, F-91405 Orsay, France
[20] Univ Paris 06, CNRS, IN2P3, LPNHE, Paris, France
[21] Univ Paris 07, CNRS, IN2P3, LPNHE, Paris, France
[22] CEA, DAPNIA, Serv Phys Particules, Saclay, France
[23] Univ Strasbourg, IPHC, Strasbourg, France
[24] Univ Haute Alsace, CNRS, IN2P3, Strasbourg, France
[25] Univ Lyon, Lyon, France
[26] Univ Lyon 1, CNRS, IPNL, IN2P3, F-69622 Villeurbanne, France
[27] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany
[28] Univ Bonn, Inst Phys, D-5300 Bonn, Germany
[29] Univ Freiburg, Inst Phys, Freiburg, Germany
[30] Johannes Gutenberg Univ Mainz, Inst Phys, D-6500 Mainz, Germany
[31] Univ Munich, Munich, Germany
[32] Univ Wuppertal, Fachbereich Phys, Wuppertal, Germany
[33] Panjab Univ, Chandigarh 160014, India
[34] Univ Delhi, Delhi 110007, India
[35] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
[36] Univ Coll Dublin, Dublin 2, Ireland
[37] Korea Univ, Korea Detector Lab, Seoul 136701, South Korea
[38] Sungkyunkwan Univ, Suwon, South Korea
[39] CINVESTAV, Mexico City 14000, DF, Mexico
[40] FOM, Inst NIKHEF, NL-1098 SJ Amsterdam, Netherlands
[41] Univ Amsterdam, NIKHEF H, Amsterdam, Netherlands
[42] Radboud Univ Nijmegen, NIKHEF H, NL-6525 ED Nijmegen, Netherlands
[43] Joint Inst Nucl Res, Dubna, Russia
[44] Inst Theoret & Expt Phys, Moscow 117259, Russia
[45] Moscow MV Lomonosov State Univ, Moscow, Russia
[46] Inst High Energy Phys, Protvino, Russia
[47] Petersburg Nucl Phys Inst, St Petersburg, Russia
[48] Lund Univ, Lund, Sweden
[49] Royal Inst Technol, Stockholm, Sweden
[50] Stockholm Univ, S-10691 Stockholm, Sweden
基金
英国科学技术设施理事会;
关键词
D O I
10.1103/PhysRevLett.100.062004
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present the first model-independent measurement of the helicity of W bosons produced in top quark decays, based on a 1 fb(-1) sample of candidate t (t) over bar events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron p (p) over bar Collider. We reconstruct the angle theta(*) between the momenta of the down-type fermion and the top quark in the W boson rest frame for each top quark decay. A fit of the resulting cos theta(*) distribution finds that the fraction of longitudinal W bosons f(0)=0.425 +/- 0.166(stat)+/- 0.102(syst) and the fraction of right-handed W bosons f(+)=0.119 +/- 0.090(stat)+/- 0.053(syst), which is consistent at the 30% C.L. with the standard model.
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相关论文
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