Asymmetric Sneutrino Dark Matter in the NMSSM with Minimal Inverse Seesaw

Details Asymmetric Sneutrino Dark Matter in the NMSSM with Minimal Inverse Seesaw Asymmetric Sneutrino Dark Matter in the NMSSM with Minimal Inverse Seesaw

2011-02-28

arxiv.org/abs/1102.5644v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 3 figures

Scientific paper

We dynamically realize the supersymmetric inverse seesaw mechanism in the next to the minimal supersymmetic standard model (NMSSM) in a minimal form. The crucial observation is that the inclusion of a dimension-five operator \bar N^2S^2/M_*, which violates lepton number and is suppressed by the fundamental scale M_*, can readily produce a light neutrino mass scale m_\nu \sim 0.01$ eV. This model is protected by Z_4^R\times Z_2^M discrete symmetry and a very predictive parameter space is restricted by the requirement of naturalness. Then we study some interesting phenomenological consequencese: (i) A light sneutrino (\sim 8 GeV), which is the lightest supersymmetric particle (LSP) and then the dark matter candidate, can elegantly explain the DAMA/CoGeNT results and even account for the FERMI-LAT gamma ray signals; (ii) It is possible that the sneutrino is an asymmetric dark matter and thus the \Omega_{DM}:\Omega_b\approx 5:1 naturally predicts a light dark matter; (iii) Higgs physics maybe dramatically changed due to the significant coupling y_NLH_uN and the light sneutrinos out of the inverse seesaw sector, consequently the lightest Higgs boson is likely dominantly decay to a pair of light sneutrinos. In the DAMA/CoGeNT region, the Higgs typically decays to a pair of LSPs with branching ratio >90%

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