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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1104.4144hep-ph
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$B \to PP$和$PV$衰变中的味SU(3)对称性和QCD因子分解

Flavor SU(3) symmetry and QCD factorization in $B \to PP$ and $PV$ decays

Hai-Yang Cheng, Sechul Oh

摘要:

利用味SU(3)对称性,我们对无粲$\bar B_{u,d} (\bar B_s) \to PP, ~PV$衰变进行了模型无关分析。所有相关的拓扑图,包括可能的子领导图,如QCD-和EW-企鹅交换图和味单态弱湮灭的,介绍。事实上,QCD企鹅交换图在理解企鹅主导的衰变模式的数据方面是很重要的。在这项工作中,我们努力桥接(模型无关,但较少定量)的拓扑图或味SU(3)的方法和(定量,但有点依赖于模型)的QCD因式分解(QCDF)的方法在这些衰变,明确显示如何翻译每个味SU(3)振幅到相应的条款在QCDF框架。在用QCDF数值估计了各种味SU(3)振幅之后,我们讨论了各种物理结果,包括SU(3)破缺效应和$\bar B_s \to PV$和$\bar B_d \to PV$衰变振幅之间的一些有用的SU(3)关系。

英文摘要:

Using flavor SU(3) symmetry, we perform a model-independent analysis of charmless $\bar B_{u,d} (\bar B_s) \to PP, ~PV$ decays. All the relevant topological diagrams, including the presumably subleading diagrams, such as the QCD- and EW-penguin exchange diagrams and flavor-singlet weak annihilation ones, are introduced. Indeed, the QCD-penguin exchange diagram turns out to be important in understanding the data for penguin-dominated decay modes. In this work we make efforts to bridge the (model-independent but less quantitative) topological diagram or flavor SU(3) approach and the (quantitative but somewhat model-dependent) QCD factorization (QCDF) approach in these decays, by explicitly showing how to translate each flavor SU(3) amplitude into the corresponding terms in the QCDF framework. After estimating each flavor SU(3) amplitude numerically using QCDF, we discuss various physical consequences, including SU(3) breaking effects and some useful SU(3) relations among decay amplitudes of $\bar B_s \to PV$ and $\bar B_d \to PV$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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