标准模型可以成功的解释很多的实验现象，但是也存在着不足。由夸克味变化的中性流(FCNC) b-->s 控制的 B, Bs 介子的稀有衰变对于超出标准模型的新物理非常敏感。本课题将利用BS方结合DS方程研究 b-->s 控制的 B, Bs 介子的稀有衰变。主要包含以下几个方面：1、利用DS方程和BS方程计算标准模型中 b-->s 控制的稀有衰变的衰变宽度和分支比，讨论相对论修正对衰变的影响；2、引入最小超对称标准模型，根据新的费曼规则写出强子矩阵元和形状因子，讨论超对称模型对衰变的影响；3、分析和研究通过树图中交换一个重的 Z' 规范玻色子对 b->s 控制的稀有衰变的影响，得到 B, Bs 稀有衰变的衰变宽度和分支比，为实验观察提供理论指导。

The standard model(SM) is very successful in explaining much more experiments, but there are many weaknesses for SM. Rare B, Bs decay mediated by the flavor-changing neutral current (FCNC) b-->s transition are sensitive probes of physics beyond the SM. We will study rare B, Bs decays mediated by the flavor-changing neutral b->s transition with BS and DS equations. There are three important parts: 1、We canculate the decay width and branching ratio of rare B, Bs decays which are controlled by b-->s transition in SM, and we also consider the effect of relativistic correction; 2、Writing down hadronic matrix element and form factor in term of the new Feynman gauge in The Minimal Supersymmetric Standard Model, and discussing the contribution of MSSM to rare B, Bs decay; 3、Studying the rare B, Bs decay which is exchanging a Z' gauge boson at tree level in b-->s transition, getting the decay width and branching ratio of rare B, Bs decays, provide the theoretical results to experiments.