QCD因子化框架下无粲B_c→VV衰变过程研究  

Charmless B_c→VVDecay in the QCD Factorization Approach

作　　者：常钦 徐帅 王娜 

机构地区：[1]河南师范大学物理与材料科学学院,河南新乡453007

出　　处：《信阳师范学院学报（自然科学版）》2017年第4期539-542,共4页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(11475055)

摘　　要：在QCD因子化框架下对Bc→VV(V代表轻矢量介子)无粲衰变进行了研究.在计算中采用两种方案来处理端点发散问题,方案Ⅰ是采用参数化方法,方案Ⅱ是Cornwall提出的红外有限胶子传播子.结果表明,在Bc→VV过程中,发散只存在于幂次压低的贡献中.与此同时,采用方案Ⅱ后,湮灭图的贡献得到了增强.从数值结果上来看,Bc→ρ-ω,K*-K*0过程有着较大的分支比,在10-7量级,因而有望在高能物理实验上被较早地观测到.The charmless Bc→VV decays within the framework of QCD factorization were studied. In the evaluation,two different schemes for regulating the end-point divergence were adopted. The schemeⅠwas to use parameterization model,while the scheme Ⅱ was based on the infrared finite gluon propagator of Cornwall prescription. It is found that the end-point divergence appears only in the power-suppressed corrections in the annihilation amplitudes.Numerically,in the decay modes considered in this paper,the Bc→ρ-ω,K＊-K＊ 0decays have the relatively large branching fractions,on the order of 10-7,and hence are hopeful to be firstly observed by the future experiments.

关 键 词：BC介子 弱湮灭 QCD因子化 

分 类 号：O572.33[理学—粒子物理与原子核物理]