Abstract
The BLMSSM is an extension of the minimal supersymmetric standard model (MSSM). Its local gauge group is . Supposing the lightest scalar neutrino is a dark matter candidate, we study the relic density and the spin independent cross section of sneutrino scattering off a nucleon. We calculate the numerical results in detail and find a suitable parameter space. The numerical discussion can confine the parameter space and provide a reference for dark matter research.
Highlights
Since it was first proposed in the 1920s, the existence of dark matter has been confirmed by many observations and experiments
Supposing the lightest scalar neutrino is dark matter candidate, we study the relic density and the spin independent cross section of sneutrino scattering off nucleon
With the parameters satisfying the relic density, which is shown in the front parts of this section, we study the spin-independent cross section σSI for sneutrino scattering off nucleon versus ǫii in the FIG.10. σSI increases slightly with the enlarging ǫii from 9 × 104 GeV2 to 12 × 104 GeV2
Summary
Since it was first proposed in the 1920s, the existence of dark matter has been confirmed by many observations and experiments. In the current dark matter research, there are many dark matter candidates They include massive compact halo objects(MACHOs)[10,11,12], primordial black holes, neutrinos, axion and weakly-interacting massive particles(WIMPs)[13,14,15,16,17]. In MSSM, the scalar neutrinos are just left-handed and interact with gauge bosons at tree level It can not satisfy the constraints from the relic density or direct detection experiments because of large cross section. There are other studies of sneutrino dark matter in the extensions of MSSM[20,21,22,23,24,25,26,27]
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