Galactic Center gamma-ray excess and Higgs-portal Dark Matter

TL;DR

This paper explores Higgs-portal dark matter models, particularly the gauged U(1)_{B-L} model, as a potential explanation for the gamma-ray excess observed near the galactic center, consistent with multiple experimental constraints.

Contribution

It demonstrates that Higgs-portal dark matter models, especially the gauged U(1)_{B-L} model, can simultaneously explain gamma-ray excess and satisfy collider and detection constraints.

Findings

Gauged U(1)_{B-L} model aligns with Fermi-LAT gamma-ray data.

Model parameters satisfy LHC Higgs search constraints.

Dark matter relic abundance and direct detection limits are compatible.

Abstract

From astronomical observations, we know that dark matter exists and makes up $\sim$25\% of our Universe. Recently the study of anomalous gamma-ray emission in the regions surrounding the galactic center has drawn a lot of attention. It has been pointed out that the excess of 1-3 GeV gamma-ray in the low latitude is consistent with the emission expected from annihilating dark matter. I will discuss the Higgs-portal dark matter models which can explain these phenomena because of the presence of scalar resonance. In addition, the parameter space of these models also satisfy constraints from the LHC Higgs searches, relic abundance and direct detection experiments. The gauged $U(1)_{B-L}$ model is very well suited with the FERMI-LAT observation along with other constraints.