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

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.

Comments: 10 pages, 2 figures, version published in PRD