Study Of The Flavor Violating Process E~+e~-→τ~+μ~-in BLMSSM

The discovery of the Higgs in2013has proved the correctness of the standard model. Atthe same time, new phenomenon of the particle physics have constantly been detected in thehigh area. People draw attention to the Daya Bay neutrino oscillation experiment. Final resultdemonstrate that the neutrino has tiny mass, which can not explained by the SM. Other factsalso indicate the limitation of the SM.In order to solve the contradiction, many new modelsbeyond SM have been proposed successively. We calculate the processe e inthe BLMSSM model on one-loop level by the software FeynCalc and LoopTools. Then weget some significant numerical results.We organize this paper as follows. In chapter1,the background、research、our main jobhave been introduced. In chapter2, we introduce the structure of the MSSM(minimalsupersymmetric standard model) and deduced the feynman rules of the BLMSSM(B and Lgauged MSSM) in chapter4. In chapter3,we illustrate the software FeynCalc and LoopToolswhich are used for calculate the amplitude of the Feynman diagrams. In chapter5,Wecalculate the processe e in the BLMSSM model on one-loop level, the crosssection dependences of the parameter S (center-of mass energy) are researched and getour conclusion in the chapter6.