Measurements of the branching fractions for J/psi and psi ' -> Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta
文献类型：期刊论文
| 作者 | BESIII Callaboration |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2013 |
| 卷号 | 87期号:5 |
| 关键词 | DECAYS PUZZLE |
| 通讯作者 | Ablikim, M (reprint author), Inst High Energy Phys, Beijing 100049, Peoples R China. |
| 英文摘要 | 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 |
| 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:000315737200002 |
| 公开日期 | 2016-02-26 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/213484]  |
| 专题 | 高能物理研究所_实验物理中心 |
| 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 Callaboration. Measurements of the branching fractions for J/psi and psi ' -> Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta[J]. PHYSICAL REVIEW D,2013,87(5). |
| APA | BESIII Callaboration.(2013).Measurements of the branching fractions for J/psi and psi ' -> Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta.PHYSICAL REVIEW D,87(5). |
| MLA | BESIII Callaboration."Measurements of the branching fractions for J/psi and psi ' -> Lambda(Lambda)over-bar pi(0) and Lambda(Lambda)over-bar eta".PHYSICAL REVIEW D 87.5(2013). |
入库方式： OAI收割
来源：高能物理研究所
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