Abstract
The U(1)X extension of the minimal supersymmetric standard model (MSSM) is called as U(1)XSSM with the local gauge group SU(3)C×SU(2)L×U(1)Y×U(1)X. U(1)XSSM has three singlet Higgs superfields beyond MSSM. In U(1)XSSM, the mass matrix of neutralino is 8×8, whose lightest mass eigenstate possesses cold dark matter characteristic. Supposing the lightest neutralino as dark matter candidate, we study the relic density. For dark matter scattering off nucleus, the cross sections including spin-independent and spin-dependent are both researched. In our numerical results, some parameter space can satisfy the constraints from the relic density and the experiments of dark matter direct detection.
Highlights
There are several existences of dark matter in the universe, and dark matter contribution is more important than the visible matter
The lightest neutralino is supposed as dark matter candidate, and we obtain the mass matrix of neutralino in the basis
As discussed in minimal supersymmetric standard model (MSSM), the lightest neutralino is studied in detail as dark matter candidate
Summary
There are several existences of dark matter in the universe, and dark matter contribution is more important than the visible matter. Many people have studied the phenomenology of lightest neutralino in MSSM[8] and there are a lot of works of neutralino dark matter in several models. The lightest neutralino is supposed as dark matter candidate, and we obtain the mass matrix of neutralino in the basis (λB , W 0, Hd0, Hu0, λX , η, η ̄, s). This is caused by the super partners of the added three Higgs singlets and new gauge boson, which mix with the MSSM neutralino superfields. To save space in the text, other used couplings are collected in the appendix
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