Direct observation of the strange b baryon Ξb-

被引：117

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

共 14 条

[1] The upgraded DO detector [J].

Abazov, V. M. ;

Abbott, B. ;

Abolins, M. ;

Acharya, B. S. ;

Adams, D. L. ;

Adams, M. ;

Adams, T. ;

Agelou, M. ;

Agram, J. -L. ;

Ahmed, S. N. ;

Ahn, S. H. ;

Ahsan, M. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Anastasoaie, M. ;

Andeen, T. ;

Anderson, J. T. ;

Anderson, S. ;

Andrieu, B. ;

Angstadt, R. ;

Anosov, V. ;

Arnoud, Y. ;

Arov, M. ;

Askew, A. ;

Asman, B. ;

Assis Jesus, A. C. S. ;

Atramentov, O. ;

Autermann, C. ;

Avila, C. ;

Babukhadia, L. ;

Bacon, T. C. ;

Badaud, F. ;

Baden, A. ;

Baffioni, S. ;

Bagby, L. ;

Baldin, B. ;

Balm, P. W. ;

Banerjee, P. ;

Banerjee, S. ;

Barberis, E. ;

Bardon, O. ;

Barg, W. ;

Bargassa, P. ;

Baringer, P. ;

Barnes, C. ;

Barreto, J. ;

Bartlett, J. F. .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2006, 565 (02) :463-537

[2]

ABAZOV VM, ARXIV07043909

[3]

Abdallah J, 2005, EUR PHYS J C, V44, P299, DOI 10.1140/epjc/s2005-02388-4

[4]

BARBERIO E, ARXIV07043575

[5] RIGOROUS QCD ANALYSIS OF INCLUSIVE ANNIHILATION AND PRODUCTION OF HEAVY QUARKONIUM [J].

BODWIN, GT ;

BRAATEN, E ;

LEPAGE, GP .

PHYSICAL REVIEW D, 1995, 51 (03) :1125-1171

[6] Rigorous QCD analysis of inclusive annihilation and production of heavy quarkonium (vol 51, pg 1125, 1995) [J].

Bodwin, GT ;

Braaten, E ;

Lepage, GP .

PHYSICAL REVIEW D, 1997, 55 (09) :5853-5854

[7]

BRUN R, 1993, UNPUB CERN PROGRAM W, V5013

[8] Strange b baryon production and lifetime in Z decays [J].

Buskulic, D ;

DeBonis, I ;

Decamp, D ;

Ghez, P ;

Goy, C ;

Lees, JP ;

Lucotte, A ;

Minard, MN ;

Nief, JY ;

Odier, P ;

Pietrzyk, B ;

Casado, MP ;

Chmeissani, M ;

Crespo, JM ;

Delfino, M ;

Efthymiopoulos, I ;

Fernandez, E ;

FernandezBosman, M ;

Garrido, L ;

Juste, A ;

Martinez, M ;

Orteu, S ;

Padilla, C ;

Park, IC ;

Pascual, A ;

Perlas, JA ;

Riu, I ;

Sanchez, F ;

Teubert, F ;

Coaleo, A ;

Creanza, D ;

dePalma, M ;

Gelao, G ;

Girone, M ;

Iaselli, G ;

Maggi, G ;

Maggi, M ;

Marinelli, N ;

Nuzzo, S ;

Ranieri, A ;

Raso, G ;

Ruggieri, F ;

Selvaggi, G ;

Silvestris, L ;

Tempesta, P ;

Zito, G ;

Huang, X ;

Lin, J ;

Ouyang, Q ;

Wang, T .

PHYSICS LETTERS B, 1996, 384 (1-4) :449-460

[9] SPECTROSCOPY WITH HEAVY-QUARK SYMMETRY [J].

ISGUR, N ;

WISE, MB .

PHYSICAL REVIEW LETTERS, 1991, 66 (09) :1130-1133

[10] Heavy baryon masses in the 1/m(Q) and 1/N-c expansions [J].

Jenkins, E .

PHYSICAL REVIEW D, 1996, 54 (07) :4515-4531

← 1 2 →