B ⁰— B¯0 mixing in the U(1)X SSM

U (1) X SSM is a non-universal Abelian extension of the Minimal Supersymmetric Standard Model and its local gauge group is extended to SU (3) C × SU (2) L × U (1) Y × U (1) X . Based on the latest data of neutral meson mixing and experimental limitations, we investigate the process of <?CDATA B⁰-B⁰?> B 0 − B 0 ¯ mixing in U (1) X SSM. Using the effective Hamiltonian method, the Wilson coefficients and mass difference Δ m B are derived. The abundant numerical results verify that <?CDATA \,vS,\,MD²,\,λ C,\,μ ,\,M₂,\,tan β ,\,g_YX,\,M₁?> v S , M D 2 , λ C , μ , M 2 , tan β , g YX , M 1 and λ H are sensitive parameters to the process of <?CDATA B⁰-B⁰?> B 0 − B 0 ¯ mixing. With further measurement in the experiment, the parameter space of the U (1) X SSM will be further constrained during the mixing process of <?CDATA B⁰-B⁰?> B 0 − B 0 ¯ .