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

TL;DR

This paper extends the Zee-Babu model by adding scalar dark matter and a dark scalar, aiming to simultaneously explain the Fermi-LAT gamma-ray excess, neutrino masses, and Higgs decay anomalies.

Contribution

It introduces a novel scalar dark matter extension of the Zee-Babu model with global symmetry, linking dark matter annihilation signals to neutrino physics and collider observations.

Findings

Scalar dark matter can produce the gamma-ray excess via annihilation into photons.

The model can account for the observed dark matter relic density.

Predicted direct detection rates are close to current experimental bounds.

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 $\varphi$ 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 $B ( H \rightarrow \gamma\gamma )$, 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.