LHCb实验上新奇特重子的发现

doi:10.3969/j.issn.0253-2778.2016.07.004

中国科学技术大学学报 ›› 2016, Vol. 46 ›› Issue (7): 557-566.DOI: 10.3969/j.issn.0253-2778.2016.07.004

LHCb实验上新奇特重子的发现

张黎明(LHCb合作组)

清华大学高能物理研究中心，北京 100084

收稿日期:2015-11-30 修回日期:2016-04-20 出版日期:2016-07-31 发布日期:2016-07-31
作者简介:ZHANG Liming, male,born in 1979, PhD/associate professor. Research field: high energy physics. E-mail: liming.zhang@cern.ch

New results on exotic baryon resonances at LHCb

ZHANG Liming (for the LHCb Collaboration)

Center for High Energy Physics, Tsinghua University, Beijing 100084, China

Received:2015-11-30 Revised:2016-04-20 Online:2016-07-31 Published:2016-07-31

摘要/Abstract

摘要： 介绍了LHCb实验上观测到的J/ψp奇特共振结构的实验证据.在Λ0b→J/ψK-p衰变中，J/ψp系统显示出两个共振态，每个至少含有五个夸克cuud，和五夸克态相符.每个态的信号显著度都大于9倍的标准差.它们的质量为（4 380±8±29）MeV和（4 449.8±1.7±2.5）MeV, 对应的宽度为（205±18±86）MeV, 和（39±5±19）MeV. 最有可能自旋一个为3/2，另一个为5/2，宇称相反.

关键词: LHCb, 奇特重子, 隐形粲偶素五夸克态

Abstract: Observation of exotic resonant structures decaying into J/ψp found in the LHCb experiment is discussed. Examination of the J/ψp system in Λ0b→J/ψK-p decays shows two states, each of which must be composed of at least cuud quarks, and are thus consistent with pentaquarks. The significance of each of these resonances is more than 9 standard deviations. Their masses are (4 380±8±29)MeV and (4 4498±17±25)MeV, and their corresponding widths are (205±18±86)MeV, and (39±5±19)MeV. The preferred JP assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.

Key words: LHCb, exotic baryon, hidden-charmonium pentaquark

张黎明(LHCb合作组). LHCb实验上新奇特重子的发现[J]. 中国科学技术大学学报, 2016, 46(7): 557-566.

ZHANG Liming (for the LHCb Collaboration). New results on exotic baryon resonances at LHCb[J]. Journal of University of Science and Technology of China, 2016, 46(7): 557-566.

LHCb实验上新奇特重子的发现

New results on exotic baryon resonances at LHCb

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