Return of the WIMP: Missing energy signals and the Galactic Center excess

Abstract

In a recent work, we emphasized that an excess in trilepton events plus missing energy observed by the ATLAS experiment at the LHC could be interpreted as a signal of low-energy supersymmetry. In such a scenario the lightest neutralino mass is approximately mχ≃60 GeV and the direct dark matter detection cross section is naturally below the current bound. In this work we present simple extensions of this scenario that lead to an explanation of the gamma-ray excess at the center of the Galaxy observed by Fermi-LAT, as well as the antiproton excess observed by AMS-02. These extensions include the addition of a small CP-violating phase in the neutralino sector or the addition of a light CP-odd Higgs scalar. Our study is of special relevance in view of a recent analysis that casts doubt on the previously accepted preference for millisecond pulsars as the origin of the Galactic Center excess.