Non-spectator contributions to lifetime of Lambda(b)

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	Non-spectator contributions to lifetime of Lambda(b)
	Wang, GL; Chang, CH; Guo, P; Li, XQ; Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
刊名	COMMUNICATIONS IN THEORETICAL PHYSICS
	2004
卷号	42 期号:5 页码:723-734
关键词	Oscillator Quark-model Inclusive Weak Decays B-meson Decays Effective-field-theory Heavy-quark Semileptonic-b Discarding 1/n(c) Qcd Factorization V-ub Hadrons
ISSN号	0253-6102
英文摘要	In this work, we study the contributions of non-spectator effect's to the lifetimes of A(b) and B-mesons comparatively. Based on the well-established theoretical framework about the effective weak Lagrangian, we derive the formulation of the non-spectator effects at the quark level. Especially, for Ab we have considered two pictures: the three-valence-quark picture and the quark-diquark picture. In the two pictures, the interference contributions to the total width are different, in this work, we investigate the interference effects in detail. As a preliminary estimate on the lifetimes, we evaluate the hadronic matrix elements appearing in the final formulas of the lifetimes by means of a simple phenomenological model for both pictures. Our results show that the contributions of the non-spectator effects can reduce the ratio of lifetime of Ab to that of B-mesons by 5 similar to 7%. It is noted that in, the quark-diquark picture the ratio can be further reduced if excited states of the diquark system are taken into account. We conclude that the measured ratio tau(A(b))/T(B-0) similar or equal to 0.79 [The Data Group, Phys. Rev. D66 (2002) 010001] can be partly understood by the non-spectator effects, although the problem on the discrepancy between theoretical prediction and experimental measurement is not fully solved.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000225674200018
公开日期	2012-08-30
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/13969]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Wang, GL,Chang, CH,Guo, P,et al. Non-spectator contributions to lifetime of Lambda(b)[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2004,42(5):723-734.
APA	Wang, GL,Chang, CH,Guo, P,Li, XQ,&Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China..(2004).Non-spectator contributions to lifetime of Lambda(b).COMMUNICATIONS IN THEORETICAL PHYSICS,42(5),723-734.
MLA	Wang, GL,et al."Non-spectator contributions to lifetime of Lambda(b)".COMMUNICATIONS IN THEORETICAL PHYSICS 42.5(2004):723-734.