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).

引用

页数：8

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