Class of Higgs-portal Dark Matter models in the light of gamma-ray excess from Galactic center

Understand

Recently the study of anomalous gamma-ray emission in the regions surrounding the galactic center has drawn a lot of attention as it points out that the excess of $\sim 1-3$ GeV gamma-ray in the low latitude is consistent with the emission expected from annihilating dark matter.

• The best-fit to the gamma-ray spectrum corresponds to dark matter (DM) candidate having mass in the range $\sim 31-40$ GeV annihilating into $b\bar{b}$-pair with cross-section $\langle \sigma v \rangle = (1.4-2.0)\times 10^{-26}\;\textrm{cm}^3 \textrm{sec}^{-1}$.
• We have shown that the Higgs-portal dark matter models in presence of scalar resonance (in the annihilation channel) are well-suited for explaining these phenomena.
• In addition, the parameter space of these models also satisfy constraints from the LHC Higgs searches, relic abundance and direct detection experiments.