Abstract
The Fermi Large Area Telescope observed an excess in gamma-ray emission spectrum coming from the center of the Milky Way galaxy. This data reveals that a light dark matter (DM) candidate of mass in the range 31–40 GeV, dominantly decaying into bb̄ final state, can explain the presence of the observed bump in photon energy. We try to interpret this observed phenomena by sneutrino DM annihilation into pair of fermions in the Supersymmetric Inverse Seesaw Model (SISM). This model can also account for tiny non-zero neutrino masses satisfying existing neutrino oscillation data. We show that a Higgs portal DM in this model is in perfect agreement with this new interpretation besides satisfying all other existing collider, cosmological and low energy experimental constraints.
Highlights
The existence of weakly-interacting massive Dark Matter (WIMP-DM) in the universe is a well established fact supported by various cosmological and astrophysical observations
The energy spectrum and angular distribution of this signal indicates the existence of an extra component compatible with DM annihilation into secondary photons coming from charged fermionic final states
5 Conclusions: The Fermi-Large Area Telescope (LAT) has observed an excess in gamma-ray flux in the galactic center with latitude |b| < 5◦ that can be explained by secondary photons originating from DM annihilation into charged fermionic final states
Summary
The existence of weakly-interacting massive Dark Matter (WIMP-DM) in the universe is a well established fact supported by various cosmological and astrophysical observations. The above mentioned galactic center gamma ray excess data can not be explained by this heavy neutralino dark matter particle, instead one should look for another viable DM candidate, the sneutrino, the scalar superpartner of the left-handed neutrino in MSSM. The invisible decay width of SM Z-boson [31,32,33] This sneutrino dark matter scenario may still be viable, if one introduces a right handed singlet chiral superfield, one for each family generation in the MSSM. After fitting neutrino oscillation data in the model and choosing the parameter space to fit a suitable scalar DM candidate, we obtain a μs at most in keV order This creates a small non-degeneracy in sneutrino masses obtained from two block-diagonal matrices in keV order. These eigenstates are, considered degenerate for the present study
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