中国物理学会高能物理分会第十三届全国粒子物理学术会议（2021）

U(1)XSSM is the extension of the minimal supersymmetric standard model (MSSM) and its local gauge group is SU(3)C X SU(2)L X U(1)Y X U(1)X. To obtain this model, three singlet new Higgs superfields and right-handed neutrinos are added to MSSM. In the framework of U(1)XSSM, we study the lightest CP-even sneutrino and neutralino as cold dark matter candidates. The relic density and the cross section for dark matter scattering off nucleon are both researched. In suitable parameter space of the model, the numerical results satisfy the constraints of the relic density and the cross section with the nucleon.