Can Zee-Babu model implemented with scalar dark matter explain both Fermi-LAT 130 GeV $\gamma$-ray excess and neutrino physics ?

Abstract

We extend the Zee-Babu model for the neutrino masses and mixings by first incorporating a scalar dark matter $X$ with $Z_2$ symmetry and then $X$ and a dark scalar $\phi$ with global $U(1)$ symmetry. In the latter scenario the singly and doubly charged scalars that are new in the Zee-Babu model can explain the large annihilation cross section of a dark matter pair into two photons as hinted by the recent analysis of the Fermi $\gamma$-ray space telescope data. These new scalars can also enhance the $B(H\to \gamma \gamma )$, as the recent LHC results may suggest. The dark matter relic density can be explained. The direct detection rate of the dark matter is predicted to be about one order of magnitude down from the current experimental bound in the first scenario.

Comments: 21 pages, 12 figures, extended the models