Saving the MSSM from the Galactic Center Excess

TL;DR

This paper explores how the minimal supersymmetric model can explain the Fermi LAT Galactic center excess, identifying viable parameter regions and constraints from experiments, especially favoring heavier dark matter particles annihilating into top quarks.

Contribution

It provides a comprehensive analysis of MSSM parameter space considering uncertainties, extending viable dark matter masses above 250 GeV, and discusses experimental constraints.

Findings

Viable MSSM regions linked to different annihilation channels.

Preference for heavier dark matter annihilating into top quarks.

Strong constraints from direct detection experiments ruling out lighter masses.

Abstract

The minimal supersymmetric setup offers a comprehensive framework to interpret the Fermi LAT Galactic center excess. Taking into account experimental, theoretical, and astrophysical uncertainties we can identify valid parameter regions linked to different annihilation channels. They extend to dark matter masses above 250 GeV. There exists a very mild tension between the observed relic density and the annihilation rate in the center of our galaxy for specific channels. The strongest additional constraints come from the new generation of direct detection experiments, ruling out much of the light and intermediate dark matter mass regime and giving preference to heavier dark matter annihilating into a pair of top quarks.