Rare semileptonic decays of heavy mesons in the heavy quark limit  

作　　者：李海波 杨茂志 

机构地区：[1]Institute of High Energy Physics,CAS [2]School of Physics,Nankai University

出　　处：《Chinese Physics C》2010年第2期262-266,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10575108,10521003,10735080,10975077);100 Talents program of CAS and Knowledge Innovation Project of CAS (U-612,U-530 (IHEP))

摘　　要：We study the branching ratios of D^＋ → D^0e^＋ν, Ds^＋ → D^0e^＋ν, Bs^0→B^＋e^-^-ν, Ds^＋→D^＋e^-e^＋ and Bs^0→B^0e^-e^＋ rare semileptonic decay processes, which are induced by decays of light quarks, the heavy quarks remain unchanged. The branching ratios of these decay processes are estimated in the heavy quark limit and with SU（3） flavor symmetry. We find that the decay rates are very tiny in the framework of the Standard Model. We also estimate the sensitivities of the measurements of these rare decays at the future experiments, such as BES-Ⅲ, super-B and LHC-b. Observations of these decays may shed some light on new physics beyond the standard model.We study the branching ratios of D^＋ → D^0e^＋ν, Ds^＋ → D^0e^＋ν, Bs^0→B^＋e^-^-ν, Ds^＋→D^＋e^-e^＋ and Bs^0→B^0e^-e^＋ rare semileptonic decay processes, which are induced by decays of light quarks, the heavy quarks remain unchanged. The branching ratios of these decay processes are estimated in the heavy quark limit and with SU（3） flavor symmetry. We find that the decay rates are very tiny in the framework of the Standard Model. We also estimate the sensitivities of the measurements of these rare decays at the future experiments, such as BES-Ⅲ, super-B and LHC-b. Observations of these decays may shed some light on new physics beyond the standard model.

关 键 词：weak decay heavy quark flavor symmetry 

分 类 号：O572.33[理学—粒子物理与原子核物理]