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题名: Non-spectator contributions to lifetime of Lambda(b)
作者: Chang, CH ;  Guo, P ;  Li, XQ ;  Wang, GL
刊名: COMMUNICATIONS IN THEORETICAL PHYSICS
出版日期: 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
学科分类: Physics
通讯作者: Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
部门归属: Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; CCAST, World Lab, Beijing 100080, Peoples R China; Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China
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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000225674200018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13969
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Chang, CH,Guo, P,Li, XQ,et al. Non-spectator contributions to lifetime of Lambda(b)[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2004,42(5):723-734.
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