标题:Measurements of the branching fractions for J/psi and psi ' -> Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta
作者:Ablikim, M.; Achasov, M. N.; Albayrak, O.; Ambrose, D. J.; An, F. F.; An, Q.; Bai, J. Z.; Ban, Y.; Becker, J.; Bennett, J. V.; Ber 更多
作者机构:[Ablikim, M.; An, F. F.; Bai, J. Z.; Cai, X.; Cao, G. F.; Chang, J. F.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, Y. B.; Chu, Y. P.; Dai, 更多
通讯作者:Ablikim, M
通讯作者地址:[Ablikim, M]Inst High Energy Phys, Beijing 100049, Peoples R China.
来源:PHYSICAL REVIEW D
出版年:2013
卷:87
期:5
DOI:10.1103/PhysRevD.87.052007
摘要:We report on a study of the isospin-violating and isospin-conserving decays of the J/psi and psi' charmonium state to Lambda(Lambda) over bar pi(0) and Lambda(Lambda) over bar eta, respectively. The data are based on 225 million J/psi and 106 million psi' events that were collected with the BESIII detector. The most accurate measurement of the branching fraction of the isospin-violating process J/psi -> Lambda(Lambda) over bar pi(0) is obtained, and the isospin-conserving processes J/psi -> Lambda(Lambda) over bar eta and psi' -> Lambda(Lambda) over bar eta are observed for the first time. The branching fractions are measured to be B(J/psi -> Lambda(Lambda) over bar pi(0)) = (3.78 +/- 0.27(stat) +/- 0.30(sys)) x 10(-5), B(J/psi -> Lambda(Lambda) over bar eta) = (15.7 +/- 0.80(stat) +/- 1.54(sys)) x 10(-5) and B(psi' -> Lambda(Lambda) over bar eta) = (2.48 +/- 0.34(stat) +/- 0.19(sys)) x 10(-5). No significant signal events are observed for psi' -> Lambda(Lambda) over bar pi(0) decay resulting in an upper limit of the branching fraction of B(psi' -> Lambda(Lambda) over bar pi(0)) < 0.29 x 10(-5) at the 90% confidence level. The two-body decay of J/psi -> Sigma(1385)(0)<(Lambda)over bar> + c.c. is searched for, and the upper limit is B(J/psi -> Sigma(1385)(0)(Lambda) over bar + c.c.) < 0.82 x 10(-5) at the 90% confidence level. DOI: 10.1103/PhysRevD.87.052007
收录类别:SCIE
资源类型:期刊论文
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