TeV dark matter and the DAMPE electron excess

TL;DR

This paper explores whether Dirac fermion dark matter charged under a new gauge symmetry can explain the 1.4 TeV electron excess observed by DAMPE, considering various astrophysical and collider constraints.

Contribution

It proposes a dark matter model with a new gauge interaction that can account for the DAMPE excess while satisfying existing experimental constraints.

Findings

Dark matter annihilations in a local subhalo can explain the DAMPE excess.

The model is consistent with relic density and direct detection constraints.

Annihilation cross section aligns with the canonical thermal value.

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.