Double Charm Decays of B Mesons in mSUGRA Model  

作　　者：吕林霞 肖振军 王帅伟 李文君 

机构地区：[1]Physics and Electronic Engineering College,Nanyang Normal University [2]Department of Physics and Institute of Theoretical Physics,Nanjing Normal University [3]Department of Physics,Henan Normal University

出　　处：《Communications in Theoretical Physics》2011年第7期125-133,共9页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos. 10947020 and 11005033;Foundation of Henan Educational Committee for Youth Backbone Scholars in Colleges and Universities;the Natural Science Foundation of the Eduction Department of Henan Province under Grant No. 2010A140012;Natural Science Foundation of Henan Province under Grant No. 102300410210

摘　　要：Based on the low energy effective Hamiltonian with naive factorization, we calculate the branching ratios （BRs） and CP asymmetries （CPAs） for the twenty three double charm decays B/B8 → D（＊）D（＊） in both the standard （s） （s） model （SM） and the minimal supergravity （mSUGRA） model. Within the considered parameter space, we find that （a） the theoretical predictions for the BRs, CPAs and the polarization fractions in the SM and the mSUGRA model are all consistent with the currently available data within ±2σ errors; （b） For all the considered decays, the supersymmetric contributions in the mSUGRA model are very small, less than 7% numerically. It may be difficult to observe so small SUSY contributions even at LHC.

关 键 词：charm decay minimal supergravity model branching ratio CP asymmetry 

分 类 号：O572.33[理学—粒子物理与原子核物理] O572.245[理学—物理]