Explaining the DAMPE $e^+ e^-$ excess using the Higgs triplet model with a vector dark matter

TL;DR

This paper proposes a dark matter model based on the Higgs triplet and hidden gauge symmetry to explain the DAMPE $e^+ e^-$ excess, fitting multiple cosmic ray observations.

Contribution

It introduces a novel dark matter model with stable gauge bosons and demonstrates its ability to fit cosmic ray data including DAMPE, AMS-02, and Fermi-LAT.

Findings

Model can explain the $e^+ e^-$ excess observed by DAMPE.

Parameter space identified that matches relic abundance and cosmic ray flux.

Good fit achieved for combined cosmic ray spectrum data.

Abstract

We explain the $e^+ e^-$ excess observed by the DAMPE Collaboration using a dark matter model based upon the Higgs triplet model and an additional hidden $SU(2)_X$ gauge symmetry. Two of the $SU(2)_X$ gauge bosons are stable due to a residual discrete symmetry and serve as the dark matter candidate. We search the parameter space for regions that can explain the observed relic abundance, and compute the flux of $e^+ e^-$ coming from a nearby dark matter subhalo. With the inclusion of background cosmic rays, we show that the model can render a good fit to the entire energy spectrum covering the AMS-02, Fermi-LAT and DAMPE data.