Evidence for semileptonic B- -> p(p)over-barl(-)(nu)over-bar(l) decays | |
Belle Collaboration | |
刊名 | PHYSICAL REVIEW D
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2014 | |
卷号 | 89期号:1 |
通讯作者 | Tien, KJ (reprint author), Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan. |
英文摘要 | We find evidence for the semileptonic baryonic decay B- -> p (p) over barl(-)(nu) over bar (l) (l = e, mu), based on a data sample of 772 million B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider. A neural-network based hadronic B-meson tagging method is used in this study. The branching fraction of B- -> p (p) over barl(-)(nu) over bar (l) is measured to be (5.8(-2.1)(+2.4)(stat) +/- 0.9(syst)) x 10(-6) with a significance of 3.2 sigma s, where lepton universality is assumed. We also estimate the corresponding upper limit: B(B- -> p (p) over barl(-)(nu) over bar (l)) < 9.6 x 10(-6) at the 90% confidence level. This measurement helps constrain the baryonic transition form factor in B decays. |
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:000331841100001 |
公开日期 | 2016-02-26 |
内容类型 | 期刊论文 |
源URL | [http://ir.ihep.ac.cn/handle/311005/213658] ![]() |
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 | Belle Collaboration. Evidence for semileptonic B- -> p(p)over-barl(-)(nu)over-bar(l) decays[J]. PHYSICAL REVIEW D,2014,89(1). |
APA | Belle Collaboration.(2014).Evidence for semileptonic B- -> p(p)over-barl(-)(nu)over-bar(l) decays.PHYSICAL REVIEW D,89(1). |
MLA | Belle Collaboration."Evidence for semileptonic B- -> p(p)over-barl(-)(nu)over-bar(l) decays".PHYSICAL REVIEW D 89.1(2014). |
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