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Wang, WY; Wu, YL; Yan, YA; Wang, WY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
Weak matrix elements and vertical bar V-cb vertical bar in HQEFT
Source PublicationINTERNATIONAL JOURNAL OF MODERN PHYSICS A
KeywordQuark Effective Theory Meson Form-factors Effective Field-theory Heavy-quark Power Corrections Sum-rules Decays Qcd Transitions Symmetry
AbstractThe 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.
2000
ISSN0217-751X
Volume15Issue:12Pages:1817-1857
Subject AreaPhysics
Indexed BySCI
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Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/12972
Collection理论物理所科研产出_SCI论文
Corresponding AuthorWang, WY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
Recommended Citation
GB/T 7714
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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