Search for single top quarks in the tau plus jets channel using 4.8 fb-1 of p(p)over-bar collision data

被引:13
作者
Abazov, V. M. [1 ]
Abbott, B. [81 ]
Abolins, M. [71 ]
Acharya, B. S. [35 ]
Adams, M. [57 ]
Adams, T. [55 ]
Aguilo, E. [6 ,7 ,8 ,9 ]
Ahsan, M. [65 ]
Alexeev, G. D. [1 ]
Alkhazov, G. [46 ]
Alton, A. [70 ]
Alverson, G. [69 ]
Alves, G. A. [2 ]
Ancu, L. S. [42 ]
Aoki, M. [56 ]
Arnoud, Y. [17 ]
Arov, M. [66 ]
Askew, A. [55 ]
Asman, B. [47 ,48 ]
Atramentov, O. [55 ]
Avila, C. [11 ]
BackusMayes, J. [88 ]
Badaud, F. [16 ]
Bagby, L. [56 ]
Baldin, B. [56 ]
Bandurin, D. V. [65 ]
Banerjee, S. [35 ]
Barberis, E. [69 ]
Barfuss, A. -F. [18 ]
Baringer, P. [64 ]
Barreto, J. [2 ]
Bartlett, J. F. [56 ]
Bassler, U. [22 ]
Bauer, D. [50 ]
Beale, S. [6 ,7 ,8 ,9 ]
Bean, A. [64 ]
Begalli, M. [3 ]
Begel, M. [79 ]
Belanger-Champagne, C. [47 ,48 ]
Bellantoni, L. [56 ]
Benitez, J. A. [71 ]
Beri, S. B. [33 ]
Bernardi, G. [20 ,21 ]
Bernhard, R. [28 ]
Bertram, I. [49 ]
Besancon, M. [22 ]
Beuselinck, R. [50 ]
Bezzubov, V. A. [45 ]
Bhat, P. C. [56 ]
Bhatnagar, V. [33 ]
机构
[1] Joint Inst Nucl Res, Dubna, Russia
[2] Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil
[3] Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil
[4] Univ Fed ABC, Santo Andre, Brazil
[5] Univ Estadual Paulista, Inst Fis Teor, BR-01405 Sao Paulo, Brazil
[6] Univ Alberta, Edmonton, AB, Canada
[7] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada
[8] York Univ, Toronto, ON M3J 2R7, Canada
[9] McGill Univ, Montreal, PQ, Canada
[10] Univ Sci & Technol China, Hefei 230026, Peoples R China
[11] Univ Los Andes, Bogota, Colombia
[12] Charles Univ Prague, Fac Math & Phys, 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, LPC, CNRS, IN2P3, Clermont, France
[17] Univ Grenoble 1, CNRS, Inst Natl Polytech Grenoble, LPSC,IN2PC, Grenoble, France
[18] Aix Marseille Univ, CPPM, CNRS, IN2P3, Marseille, France
[19] Univ Paris 11, CNRS, LAL, IN2P3, F-91405 Orsay, France
[20] Univ Paris 06, CNRS, LPNHE, IN2P3, Paris, France
[21] Univ Paris 07, CNRS, LPNHE, IN2P3, Paris, France
[22] CEA, SPP, Saclay, France
[23] Univ Strasbourg, IPHC, CNRS, IN2P3, Strasbourg, France
[24] Univ Lyon 1, CNRS, IPNL, IN2P3, F-69622 Villeurbanne, France
[25] Univ Lyon, Lyon, France
[26] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany
[27] Univ Bonn, Inst Phys, D-5300 Bonn, Germany
[28] Univ Freiburg, Inst Phys, Freiburg, Germany
[29] Univ Gottingen, Inst Phys 2, Gottingen, 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, Mumbai 400005, Maharashtra, India
[36] Univ Coll Dublin, Dublin 2, Ireland
[37] Korea Univ, Korea Detector Lab, Seoul, South Korea
[38] Sungkyunkwan Univ, Suwon, South Korea
[39] CINVESTAV, Mexico City 14000, DF, Mexico
[40] FOM Inst NIKHEF, Amsterdam, Netherlands
[41] Univ Amsterdam NIKHEF, Amsterdam, Netherlands
[42] Radboud Univ Nijmegen NIKHEF, Nijmegen, Netherlands
[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] Stockholm Univ, S-10691 Stockholm, Sweden
[48] Uppsala Univ, Uppsala, Sweden
[49] Univ Lancaster, Lancaster, England
[50] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England
基金
巴西圣保罗研究基金会; 瑞典研究理事会; 加拿大自然科学与工程研究理事会;
关键词
Single top; Top quarks; Tau leptons; EVENTS;
D O I
10.1016/j.physletb.2010.05.003
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the first direct search for single top quark production using reconstructed tau leptons in the final state. The search is based on 4.8 fb(-1) of integrated luminosity collected in p (p) over bar collisions at root s= 1.96 TeV with the D0 detector at the Fermilab Tevatron Collider. We select events with a final state including an isolated tau lepton. missing transverse energy, two or three jets, one or two of them being identified as b quark jet. We use a multivariate technique to discriminate signal from background. The number of events observed in data in this final state is consistent with the signal plus background expectation. We set in the tau + jets channel an upper limit on the single top quark cross section of 7.3 pb at the 95% C.L. This measurement allows a gain of 4% in expected sensitivity for the observation of single top production when combining it with electron + jets and muon + jets channels already published by the DO Collaboration with 2.3 fb(-1) of data. We measure a combined cross section of 3.84(-0.83)(+0.89) pb, which is the most precise measurement to date. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:5 / 14
页数:10
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