Measurement of β (t→Wb)/β(t→Wq) at √s=1.96 TeV

被引：11

作者：

Abazov, V. M.

Abbott, B.

Abolins, M.

Acharya, B. S.

Adams, M.

Adams, T.

Agelou, M.

Agram, J. -L.

Ahn, S. H.

Ahsan, M.

Alexeev, G. D.

Alkhazov, G.

Alton, A.

Alverson, G.

Alves, G. A.

Anastasoaie, M.

Andeen, T.

Anderson, S.

Andrieu, B.

Anzelc, M. S.

Arnoud, Y.

Arov, M.

Askew, A.

Asman, B.

Jesus, A. C. S. Assis

Atramentov, O.

Autermann, C.

Avila, C.

Ay, C.

Badaud, F.

Baden, A.

Bagby, L.

Baldin, B.

Bandurin, D. V.

Banerjee, P.

Banerjee, S.

Barberis, E.

Bargassa, P.

Baringer, P.

Barnes, C.

Barreto, J.

Bartlett, J. F.

Bassler, U.

Bauer, D.

Bean, A.

Begalli, M.

Begel, M.

Bellavance, A.

Benitez, J.

Beri, S. B.

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 Janeiro, Rio De Janeiro, Brazil

[4] Univ Estadual Paulista, Inst Fis Teor, BR-01405 Sao Paulo, Brazil

[5] Univ Alberta, Edmonton, AB, Canada

[6] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada

[7] York Univ, Toronto, ON M3J 2R7, Canada

[8] McGill Univ, Montreal, PQ, Canada

[9] Inst High Energy Phys, Beijing 100039, Peoples R China

[10] Univ Sci & Technol China, Hefei 230026, 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 Clermont Ferrand, CNRS, IN2P3, Phys Corpusculaire Lab, Clermont Ferrand, France

[17] Univ Grenoble 1, CNRS, IN2P3, Lab Phys Subatom & Cosmol, Grenoble, France

[18] Univ Aix Marseille 2, CPPM, CNRS, IN2P3, Marseille, France

[19] CNRS, IN2P3, Accelerateur Lineaire Lab, 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, CNRS, IN2P3, IReS, Strasbourg, France

[24] Univ Haute Alsaca, Mulhouse, France

[25] Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France

[26] Rhein Westfal TH Aachen, Phys Inst A 3, D-5100 Aachen, Germany

[27] Univ Bonn, Inst Phys, D-5300 Bonn, Germany

[28] Univ Freiburg, Inst Phys, D-7800 Freiburg, Germany

[29] Johannes Gutenberg Univ Mainz, Inst Phys, D-6500 Mainz, Germany

[30] Univ Munich, D-80539 Munich, Germany

[31] Univ Wuppertal, Fachbereich Phys, Wuppertal, Germany

[32] Panjab Univ, Chandigarh 160014, India

[33] Univ Delhi, Delhi 110007, India

[34] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[35] Univ Coll Dublin, Dublin 2, Ireland

[36] Korea Univ, Korea Detector Lab, Seoul 136701, South Korea

[37] Sungkyunkwan Univ, Suwon 440746, South Korea

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

[39] FOM, Inst NIKHEF, NL-1098 SJ Amsterdam, Netherlands

[40] Univ Amsterdam, NIKHEF, NL-1098 SJ Amsterdam, Netherlands

[41] Radboud Univ Nijmegen, NIKHEF, Nijmegen, Netherlands

[42] Joint Inst Nucl Res, Dubna, Russia

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

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

[45] Inst High Energy Phys, Protvino, Russia

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

[47] Lund Univ, Lund, Sweden

[48] Royal Inst Technol, Stockholm, Sweden

[49] Stockholm Univ, S-10691 Stockholm, Sweden

[50] Uppsala Univ, Uppsala, Sweden

来源：

PHYSICS LETTERS B | 2006年 / 639卷 / 06期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1016/j.physletb.2006.07.019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the measurement of R = B(t -> Wb)/B(t -> Wq) in pp collisions at root s = 1.96 TeV, using 230 pb(-1) of data collected by the DO experiment at the Fermilab Tevatron Collider. We fit simultaneously R and the number (N-tt) of selected top quark pairs (tt), to the number of identified b-quark jets in events with one electron or one muon, three or more jets, and high transverse energy imbalance. To improve sensitivity, kinematical properties of events with no identified b-quark jets are included in the fit. We measure R = 1.03(-0.17)(0.19) (stat + syst), in good agreement with the standard model. We set lower limits of R > 0.61 and vertical bar V-tb vertical bar > 0.78 at 95% confidence level. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：616 / 622

页数：7

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