Relating B_S Mixing And B_S->μ~Λ+μ~Λ-with New Physics

Up to now, the standard model which can explain the vast majority collider physics results has been got a huge success. But some problems cannot be covered, e.g. neutrino oscillation、dark matter and dark energy. Studying new physics beyond the standard model now become an important topic. In the standard model, because of GIM mechanism, FCNC process is forbidden in the tree level and is strongly suppressed in the loop level. These processes could absorb the new physics effects and make the measurable physics quantities change a lot. So, FCNC process in testing the standard model and exploring new physics plays a very important role.In B physics, Bs mixing and Bs�'μ+μ-process are flavor changing neutral current, open a new window to study the new physics beyond the standard model. In some new physics models, the contribution to the mass difference ΔMB and the branching ratio of Bs�'μ+μ-are related. Here, we researched four different new physics model:extra Z’bosons, family symmetry, R-parity violating supersymmetry and flavor-changing Higgs models. At the same time, we constrained the new physics parameter space using the correlation between the mass difference ΔMBs and the branching ratio of Bs�'μ+μ-The basic structure as follow:the first chapter, We introduce the purpose and the method of this work; the second chapter, We introduce the standard model briefly. In the third chapter, We summarize our numerical inputs, then give the SM prediction、the experimental value of the mixing quantity ΔMBs and the branching fraction of Bs�'μ+μ-. The forth chapter, We first get the constrains on NP models from Bs mixing, then discuss general properties of NP models with tree-level amplitudes, use the correlation analysis method to explore various NP models, Our concluding remarks in Chapter5.