B Meson And Top Quark Rare Decays In The B-LSSM

The rare decays B?Xs?,Bs0??+?-,t?c?,t?cb,t?cZ,t?ch are important to search new physics beyond the stand ard model(SM).The SM predicts the B?Xs?,Bs0??+?-branching ratios arn agreement with the experimental results very well.Hence,the precise measurement on the rare B-decay processes constrain the new physics bleyond SM strictly.In addition,the branch ing ratios of top quark rare decays in the SM are too small to be detected in the future,so ant measurable signal for the p rocesses at the LHC is a smoking gun for new physics,Under a minimal flavor vi.olating assu mption for the soft breaking terms,we study the properties of the rare decays in the minimal supersy mmetric extension of the SM(MSSM)with U(1)B-L gauge symmetry.Compared with the MSSM,new mas;s matrix of squar ks,new gauge interaction and new particles in the B-LSSM can make contributions the these processes.Considering the constrains from updated experimental data,the numerical results show that the B-LSSM can fit the experimental data for the bra nch ing ratios of BXs?,Bso??+?-and furth er constrain the parameter space of the B-LSSM.Considering the constrains from B meson rare decays,the nu merical results of top quark rare decays imply Br(t?c?_?5×10-7,Br(t?cg)?2×10-6,Br(t?cZ)?4×10-7 and Br(tch_?3×10-9 in our chosen paraleter space.Simultaneously,new gauge coupling constants gB,gYB can also affect the theoretical predictions on Br(t?c?,cg,cZ,ch).