Top Quark Rare Decays In 2HDM With CPV

Although the standard model of particle physics has achieved great success,it still has some limitations,one of which is that it cannot provide adequate CP violation to explain the relevant fact.In this thesis,we consider a simple extension of the standard model,Two-HiggsDoublet Model?2HDM?,which add an identical Higgs doublet to the standard model.It allows complex parameters in its scalar potential,inducing new CP violation sources which are different from that in the standard model.Besides,the new parameter in this model also has influence on the CP violation generated by the complex CKM matrix.Under this model,we analyze two rare top quark decay,t?ch and t?cy and their charge-conjugated processes.Taking t?ch as an example,we demonstrate the necessary conditions to obtain the nonzero A_cp,which are the CPV parameters in the Lagrangian and the absorptive part induced by FSI in the amplitude.We analyze the source of the imaginary part of the scalar loop integration and the physical condition for it.We also give the numerical display of our work.