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Measurement of J/psi decays into Lambda(Lambda)over-bar pi(+)pi(-)
BESII Callaboration
2012
发表期刊CHINESE PHYSICS C
卷号36期号:11页码:1031-1039
通讯作者Abikim, M (reprint author), Inst High Energy Phys, Beijing 100049, Peoples R China.
摘要Based on 58 million J/psi events collected by the BES II detector at the BEPC, J/psi -> Lambda(Lambda) over bar pi(+)pi(-) is observed for the first time. The branching fraction is measured to be Br(J/psi -> Lambda(Lambda) over bar pi(+)pi(-)) = (4.30 +/- 0.13 +/- 0.99)x10(-3), excluding the decays to intermediate states, namely J/psi -> Xi(-)(Xi) over bar (+), J/psi -> Sigma(1385)(-)(Sigma) over bar (1385)(+), and J/psi -> Sigma(1385)(+)(Sigma) over bar (1385)(-). The branching fractions for these intermediate resonance channels are measured to be: Br(J/psi -> Xi(-)(Xi) over bar (+)) = (0.90 +/- 0.03 +/- 0.18) x 10(-3), Br(J/psi -> Sigma(1385)(-)(Sigma) over bar (1385)(+)) = (1.23 +/- 0.07 +/- 0.30) x 10(-3), and Br(J/psi -> Sigma(1385)(+)(Sigma) over bar (1385)(-)) = (1.50 +/- 0.08 +/- 0.38) x 10(-3), respectively. The angular distribution is of the form dN/d(cos theta) proportional to (1+ alpha cos(2)theta) with alpha = (0.35 +/- 0.29 +/- 0.06) for J/psi -> Xi(-)(Xi) over bar (+), alpha = (-0.54 +/- 0.22 +/- 0.10) for J/psi -> Sigma(1385)(-)(Sigma) over bar (1385)(+), and alpha = (-0.35 +/- 0.25 +/- 0.06) for J/psi -> Sigma(1385)(+)(Sigma) over bar (1385)(-).
关键词ANTIBARYON BARYON DETECTOR
学科领域Physics
DOI10.1088/1674-1137/36/11/001
收录类别SCI
语种英语
WOS类目Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000311660900001
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213390
专题实验物理中心
作者单位中国科学院高能物理研究所
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BESII Callaboration. Measurement of J/psi decays into Lambda(Lambda)over-bar pi(+)pi(-)[J]. CHINESE PHYSICS C,2012,36(11):1031-1039.
APA BESII Callaboration.(2012).Measurement of J/psi decays into Lambda(Lambda)over-bar pi(+)pi(-).CHINESE PHYSICS C,36(11),1031-1039.
MLA BESII Callaboration."Measurement of J/psi decays into Lambda(Lambda)over-bar pi(+)pi(-)".CHINESE PHYSICS C 36.11(2012):1031-1039.
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