Measurements of J/psi and psi(2S) decays into Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta
BES Collaboration
刊名PHYSICAL REVIEW D
2007
卷号76期号:9页码:92003
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.76.092003
通讯作者Ablikim, M (reprint author), Inst High Energy Phys, Beijing 100049, Peoples R China.
文章类型Article
英文摘要Using 58x10(6) J/psi and 14x10(6) psi(2S) events collected by the BESII detector at the BEPC, branching fractions or upper limits for the decays J/psi and psi(2S)->Lambda(Lambda) over bar pi(0) and Lambda(Lambda) over bar eta are measured. For the isospin violating decays, the upper limits are determined to be B(J/psi ->Lambda(Lambda) over bar pi(0))< 6.4x10(-5) and B[psi(2S)->Lambda(Lambda) over bar pi(0)]< 4.9x10(-5) at the 90% confidence level. The isospin conserving process J/psi ->Lambda(Lambda) over bar eta is observed for the first time, and its branching fraction is measured to be B(J/psi ->Lambda(Lambda) over bar eta)=(2.62 +/- 0.60 +/- 0.44)x10(-4), where the first error is statistical and the second one is systematic. No Lambda(Lambda) over bar eta signal is observed in psi(2S) decays, and B[psi(2S)->Lambda(Lambda) over bar eta]< 1.2x10(-4) is set at the 90% confidence level. Branching fractions of J/psi decays into Sigma(+)pi(-)(Lambda) over bar and Sigma(-)pi(+)Lambda are also reported, and the sum of these branching fractions is determined to be B(J/psi ->Sigma(+)pi(-)(Lambda) over bar +c.c.)=(1.52 +/- 0.08 +/- 0.16)x10(-3).
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别SCI
WOS记录号WOS:000251327200009
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/227945
专题中国科学院高能物理研究所_实验物理中心_期刊论文
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BES Collaboration. Measurements of J/psi and psi(2S) decays into Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta[J]. PHYSICAL REVIEW D,2007,76(9):92003.
APA BES Collaboration.(2007).Measurements of J/psi and psi(2S) decays into Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta.PHYSICAL REVIEW D,76(9),92003.
MLA BES Collaboration."Measurements of J/psi and psi(2S) decays into Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta".PHYSICAL REVIEW D 76.9(2007):92003.
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