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题名: Weak matrix elements and vertical bar V-cb vertical bar in HQEFT
作者: Wang, WY ;  Wu, YL ;  Yan, YA
刊名: INTERNATIONAL JOURNAL OF MODERN PHYSICS A
出版日期: 2000
卷号: 15, 期号:12, 页码:1817-1857
关键词: QUARK EFFECTIVE THEORY ;  MESON FORM-FACTORS ;  EFFECTIVE FIELD-THEORY ;  HEAVY-QUARK ;  POWER CORRECTIONS ;  SUM-RULES ;  DECAYS ;  QCD ;  TRANSITIONS ;  SYMMETRY
学科分类: Physics
通讯作者: Wang, WY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: The heavy quark effective held theory (HQEFT) containing both effective "quark fields" and "antiquark fields" is investigated in detail. By integrating out (but not neglecting) the effective antiquark fields, we present a new formulation of effective theory which differs from the usual heavy quark effective theory (HQET) and exhibits valuable features because of the inclusion of the contributions from the antiquark fields. Matrix elements of vector and axial vector heavy quark currents between pseudoscalar and vector mesons containing a heavy quark (b or c) are then evaluated systematically up to the order of 1/m(Q)(2) and parametrized by a set of universal form factors. With a consistent normalization condition between the effective heavy hadron states, the form factors at zero recoil are related to the ground state meson masses, which enables us to estimate the values of form factors at zero recoil. In particular, Luke's theorem comes out automatically in the new formulation of HQEFT without the need of imposing the equation of motion iv . DQ(v)(+) = 0. Consequently, the differential decay rates of both B --> D*l nu and B --> Dl nu do not receive 1/m(Q) order corrections at zero recoil, which is not the case in the usual HQET. Thus we quote that the Cabibbo-Kobayashi-Maskawa matrix element \V-cb\ can nicely be extracted from either of these two exclusive semileptonic decays at the order of 1/m(Q)(2). Our estimates for \V-cb\ are presented.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000087385200004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12972
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:
Wang, WY,Wu, YL,Yan, YA. Weak matrix elements and vertical bar V-cb vertical bar in HQEFT[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2000,15(12):1817-1857.
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