DAMPE Electron-Positron Excess in Leptophilic $Z'$ model

TL;DR

This paper proposes a leptophilic $Z'$ model with a 1.5 TeV dark matter candidate that explains the DAMPE electron-positron excess while satisfying multiple experimental constraints.

Contribution

It introduces a novel leptophilic $Z'$ scenario with a Dirac fermion dark matter that accounts for DAMPE data and complies with existing experimental bounds.

Findings

The model reproduces the DAMPE excess peak.

It remains consistent with relic density and collider constraints.

Predicts specific signatures for future detection.

Abstract

Recently the DArk Matter Particle Explorer (DAMPE) has reported an excess in the electron-positron flux of the cosmic rays which is interpreted as a dark matter particle with the mass about $1.5$ TeV. We come up with a leptophilic $Z'$ scenario including a Dirac fermion dark matter candidate which beside explaining the observed DAMPE excess, is able to pass various experimental/observational constraints including the relic density value from the WMAP/Planck, the invisible Higgs decay bound at the LHC, the LEP bounds in electron-positron scattering, the muon anomalous magnetic moment constraint, Fermi-LAT data, and finally the direct detection experiment limits from the XENON1t/LUX. By computing the electron-positron flux produced from a dark matter with the mass about $1.5$ TeV we show that the model predicts the peak observed by the DAMPE.