Weak matrix elements and vertical bar V-cb vertical bar in HQEFT
文献类型：期刊论文
| 作者 | Wang, WY; Wu, YL ; Yan, YA; Wang, WY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
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| 刊名 | INTERNATIONAL JOURNAL OF MODERN PHYSICS A
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| 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 |
| ISSN号 | 0217-751X |
| 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000087385200004 |
| 公开日期 | 2012-08-29 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/12972]  |
| 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 | Wang, WY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China. |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：理论物理研究所
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