First observation of the isospin violating decay J/psi -> Lambda(Sigma)over-bar(0) + c.c.

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	First observation of the isospin violating decay J/psi -> Lambda(Sigma)over-bar(0) + c.c.
	BESIII Collaboration
刊名	PHYSICAL REVIEW D
	2012
卷号	86 期号:3
关键词	ELECTROMAGNETIC DECAYS EXCITED HYPERONS RADIATIVE DECAY QUARK-MODEL BARYONS
通讯作者	Ablikim, M (reprint author), Inst High Energy Phys, Beijing 100049, Peoples R China.
英文摘要	Using a sample of (225.2 +/- 2.8) x 10(6) J/psi events collected with the BESIII detector, we present results of a study of J/psi -> gamma Lambda(Lambda) over bar and report the first observation of the isospin violating decay J/psi -> Lambda(Sigma) over bar (0) + c.c., in which (Sigma) over bar (0) decays to gamma (Lambda) over bar. The measured branching fractions are B(J/psi -> (Lambda) over bar Sigma(0)) = (1.46 +/- 0.11 +/- 0.12) x 10(-5) and B(J/psi -> Lambda(Sigma) over bar (0)) = (1.37 +/- 0.12 +/- 0.11) x 10(-5). We search for Lambda(1520) -> gamma Lambda decay, and find no evident signal, and an upper limit for the product branching fraction B(J/psi -> Lambda(Lambda) over bar (1520) + c.c) x B(Lambda(1520) -> gamma Lambda) < 4.1 x 10(-6) is set at the 90% confidence level. We also report the observation of eta(c) -> Lambda<(Lambda)over bar> in J/psi -> gamma eta(c), eta(c) -> Lambda(Lambda) over bar and measure the branching fraction B(eta(c) -> Lambda(Lambda) over bar) = (1.16 +/- 0.12(stat) +/- 0.19(syst) +/- 0.28(PDG)) x 10(-3).
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000307506200004
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213312]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	BESIII Collaboration. First observation of the isospin violating decay J/psi -> Lambda(Sigma)over-bar(0) + c.c.[J]. PHYSICAL REVIEW D,2012,86(3).
APA	BESIII Collaboration.(2012).First observation of the isospin violating decay J/psi -> Lambda(Sigma)over-bar(0) + c.c..PHYSICAL REVIEW D,86(3).
MLA	BESIII Collaboration."First observation of the isospin violating decay J/psi -> Lambda(Sigma)over-bar(0) + c.c.".PHYSICAL REVIEW D 86.3(2012).