Measurement of the b baryon lifetime and branching fractions in Z decays

	Measurement of the b baryon lifetime and branching fractions in Z decays
	ALEPH Collaboration
刊名	EUROPEAN PHYSICAL JOURNAL C
	1998
卷号	2 期号:2 页码:197-211
关键词	PHYSICS
通讯作者	Barate, R (reprint author), CNRS, IN2P3, Phys Particules Lab, F-74019 Annecy Le Vieux, France.
英文摘要	Using approximately 4 million hadronic Z decays recorded with the ALEPH detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with Lambda l(-) combinations, the average b baryon lifetime is measured to be 1.20 +/- 0.08 +/- 0.06 ps. From a sample of 193 fully reconstructed Lambda(c)(+) candidates correlated with a lepton and a sample of 46 Lambda l(+)l(-) combinations the Lambda(b) lifetime is measured to be 1.21+/-0.11 ps. The product branching fractions to these final states are Br(b-->Lambda(b)) . Br(Lambda(b) --> Lambda l(-)(v) over bar X) = 0.326 +/- 0.016 +/- 0.039% for the first sample and Br(b --> Lambda(b)) . Br(Lambda(b) --> Lambda(c)(+)l(-)(v) over bar X) = 0.86 +/- 0.07 +/- 0.14% for the second and third samples combined.
学科主题	Physics
类目[WOS]	Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000073323300001
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/211908]
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	ALEPH Collaboration. Measurement of the b baryon lifetime and branching fractions in Z decays[J]. EUROPEAN PHYSICAL JOURNAL C,1998,2(2):197-211.
APA	ALEPH Collaboration.(1998).Measurement of the b baryon lifetime and branching fractions in Z decays.EUROPEAN PHYSICAL JOURNAL C,2(2),197-211.
MLA	ALEPH Collaboration."Measurement of the b baryon lifetime and branching fractions in Z decays".EUROPEAN PHYSICAL JOURNAL C 2.2(1998):197-211.