Abstract
The recent high energy electron and positron flux observed by the DAMPE experiment indicates possible excess events near 1.4 TeV. Such an excess may be evidence of dark matter annihilations or decays in a dark matter subhalo that is located close to the solar system. We give here an analysis of this excess from annihilations of Dirac fermion dark matter which is charged under a new $U(1)_X$ gauge symmetry. The interactions between dark matter and the standard model particles are mediated the $U(1)_X$ gauge boson. We show that dark matter annihilations from a local subhalo can explain the excess with the canonical thermal annihilation cross section. We further discuss the constraints from the relic density, from the dark matter direct detection, from the dark matter indirect detection, from the cosmic microwave background, and from the particle colliders.
Highlights
Evidence for excess electron and positron events near 1.4 TeV has been reported by the DAMPE experiment [1]
We have proposed a simple dark matter model to explain the high energy electron excess events recently observed by the DAMPE experiment
The morphology of the energy spectrum of the excess events hints a local source for the high energy electrons
Summary
Evidence for excess electron and positron events near 1.4 TeV has been reported by the DAMPE experiment [1] Such an excess was not found previously by the AMS-02 [2,3,4] and by the Fermi-LAT [5]. The localized feature in the energy spectrum of the excess events hints a nearby source of the high energy electrons and positrons. Inspired by this excess, studies with dark matter (DM) explanation [8,9,10,11] and with astrophysical explanation [11,12] have been carried out.
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