Abstract
U(1)X SSM is the extension of the minimal supersymmetric standard model (MSSM) and its local gauge group is SU(3)C× SU(2)L× U(1)Y× 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 Higgs mass and take the lightest CP-even sneutrino as a cold dark matter candidate. For the lightest CP-even sneutrino, 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.
Highlights
The neutralino in the minimal supersymmetric standard model (MSSM) has been extensively studied [16] as one of the favorite dark matter candidates
U(1)X SSM is the extension of the minimal supersymmetric standard model (MSSM) and its local gauge group is SU(3)C × SU(2)L × U(1)Y × U(1)X
In suitable parameter space of the model, the numerical results satisfy the constraints of the relic density and the cross section with the nucleon
Summary
We suppose the lightest mass eigenstate (ν1R) of CP-even sneutrino mass squared matrix in eq (2.23) as a dark matter candidate and calculate the relic density. The ν1R number density nν1R is governed by the Boltzmann equation [3, 51,52,53]. We study its annihilation rate σv SA ( σv CA) and its relic density ΩD in the thermal history of the universe. To this end, the self-annihilation cross section σ(ν1Rν1R∗ → anything) and co-annihilation cross section σ(ν1Rφ → anything) should be calculated. MD = mν1R denoting the WIMP mass and xF ≡ mD/TF .
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