Evidence for semileptonic B- -> p(p)over-barl(-)(nu)over-bar(l) decays

	Evidence for semileptonic B- -> p(p)over-barl(-)(nu)over-bar(l) decays
	Belle Collaboration
刊名	PHYSICAL REVIEW D
	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).