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Weak matrix elements and vertical bar V-cb vertical bar in HQEFT
Wang, WY; Wu, YL; Yan, YA; Wang, WY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
2000
发表期刊INTERNATIONAL JOURNAL OF MODERN PHYSICS A
ISSN0217-751X
卷号15期号:12页码:1817-1857
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.
部门归属Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
关键词Quark Effective Theory Meson Form-factors Effective Field-theory Heavy-quark Power Corrections Sum-rules Decays Qcd Transitions Symmetry
学科领域Physics
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收录类别SCI
WOS记录号WOS:000087385200004
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被引频次:21[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12972
专题理论物理所SCI论文
通讯作者Wang, WY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
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Wang, WY,Wu, YL,Yan, YA,et al. Weak matrix elements and vertical bar V-cb vertical bar in HQEFT[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2000,15(12):1817-1857.
APA Wang, WY,Wu, YL,Yan, YA,&Wang, WY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China..(2000).Weak matrix elements and vertical bar V-cb vertical bar in HQEFT.INTERNATIONAL JOURNAL OF MODERN PHYSICS A,15(12),1817-1857.
MLA Wang, WY,et al."Weak matrix elements and vertical bar V-cb vertical bar in HQEFT".INTERNATIONAL JOURNAL OF MODERN PHYSICS A 15.12(2000):1817-1857.
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