Direct observation of the strange b baryon Ξb-

被引：116
|
作者：
Abazov, V. M. [1 ]
Abbott, B.
Abolins, M.
Acharya, B. S.
Adams, M.
Adams, T.
Aguilo, E.
Ahn, S. H.
Ahsan, M.
Alexeev, G. D.
Alkhazov, G.
Alton, A.
Alverson, G.
Alves, G. A.
Anastasoaie, M.
Ancu, L. S.
Andeen, T.
Anderson, S.
Andrieu, B.
Anzelc, M. S.
Arnoud, Y.
Arov, M.
Arthaud, 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, S.
Banerjee, P.
Barberis, E.
Barfuss, A.-F.
Bargassa, P.
Baringer, P.
Barreto, J.
Bartlett, J. F.
Bassler, U.
Bauer, D.
Beale, S.
Bean, A.
Begalli, M.
Begel, M.
Belanger-Champagne, C.
机构：
[1] Univ Michigan, Ann Arbor, MI 48109 USA
[2] Univ Buenos Aires, Buenos Aires, DF, Argentina
[3] LAFEX, Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil
[4] Univ Estado Rio De Janeiro, Rio De Janeiro, Brazil
[5] Univ Estadual Paulista, Inst Fis Teor, BR-01405 Sao Paulo, Brazil
[6] Simon Fraser Univ, Burnaby, BC, Canada
[7] Univ Alberta, Edmonton, AB, Canada
[8] York Univ, Toronto, ON, 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, Prague, Czech Republic
[14] Acad Sci Czech Republic, Inst Phys, Ctr Particle Phys, Prague, Czech Republic
[15] Univ San Francisco, Quito, Ecuador
[16] Univ Clermont Ferrand, CNRS, IN3P3, Phys Corpusculaire Lab, Clermont Ferrand, France
[17] Univ Grenoble 1, Lab Phys Subatomique & Cosmol, CNRS, IN2P3, Grenoble, France
[18] Univ Aix Marseille 2, CNRS, IN2P3, CPPM, Marseille, France
[19] Univ Paris 11, Lab Accelerateur Lineaire, CNRS, IN2P3, Orsay, France
[20] Univ Paris 06, CNRS, LPNHE, IN2P3, Paris, France
[21] Univ Paris 07, Paris, France
[22] Univ Strasbourg 1, IPHC, Strasbourg, France
[23] Univ Haute Alsace, CNRS, IN2P3, Strasbourg, France
[24] Univ Lyon 1, IPNL, CNRS, IN2P3, Villeurbanne, France
[25] Univ Lyon, Lyon, France
[26] Rhein Westfal TH Aachen, Inst Phys A 3, Aachen, Germany
[27] Inst Phys, Bonn, Germany
[28] Univ Freiburg, Inst Phys, Freiburg, Germany
[29] Johannes Gutenberg Univ Mainz, Inst Phys, D-6500 Mainz, Germany
[30] Univ Munich, Munich, Germany
[31] Univ Wuppertal, 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, Ireland
[36] Korea Univ, Korea Detector Lab, Seoul 136701, South Korea
[37] Sungkyunkwan Univ, Suwon, South Korea
[38] CINVESTAV, Mexico City, DF, Mexico
[39] FOM, Inst NIKHEF, Amsterdam, Netherlands
[40] Univ Amsterdam, NIKHEF, Amsterdam, Netherlands
[41] Univ Nijmegen St Radboud Hosp, NIKHEF, Nijmegen, Netherlands
[42] Joint Nucl Res Inst, Dubna, Russia
[43] Inst Theoret & Expt Phys, Moscow, 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] Univ Stockholm, Stockholm, Sweden
[50] Uppsala Univ, Uppsala, Sweden
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 05期
基金：
英国科学技术设施理事会;
关键词：
D O I：
10.1103/PhysRevLett.99.052001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the first direct observation of the strange b baryon Xi(-)(b)(Xi) over bar (+)(b)). We reconstruct the decay Xi(-)(b)-->J/psi Xi(-), with J/psi-->mu(+)mu(-), and Xi(-)-->Lambda pi(-)-->p pi(-)pi(-) in p (p) over bar collisions at root s = 1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(-)(b) candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of 3.3 x 10(-8) of it arising from a background fluctuation. Normalizing to the decay Lambda(b)-->J/psi Lambda, we measure the relative rate sigma(Xi(-)(b))xB(Xi(-)(b)-->J/psi Xi)/ sigma(Lambda(b))xB(Lambda(b)-->J/psi Lambda) = 0.28 +/- 0.09(stat)(-0.08)(+0.09)(syst).
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页数：8
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