DAMPE Excess from Leptophilic Vector Dark Matter: Model Independent Approach

TL;DR

This paper investigates all minimal leptophilic vector dark matter models that could explain the DAMPE cosmic ray excess, identifying two viable models with scalar or pseudoscalar mediators around 1.5 TeV.

Contribution

It provides a comprehensive, model-independent analysis of leptophilic vector dark matter extensions explaining the DAMPE excess, highlighting only two models consistent with multiple experimental constraints.

Findings

Two models with scalar/pseudoscalar mediators can produce the DAMPE signal.

The dark matter candidate has a mass around 1.5 TeV.

These models satisfy relic density, detection, and collider constraints.

Abstract

We study all extensions of the Standard Model (SM) with a vector dark matter (VDM) candidate which can explain the peak structure observed by recent DAMPE experiment in electron-positron cosmic ray spectrum. In this regard, we consider all leptophilic renormalizable VDM-SM interactions through scalar, spinor, and vector mediators. We show that only two out of six possible models could produce DAMPE signal by annihilation of VDM with the mass about 1.5 TeV in a nearby subhalo whilst simultaneously satisfying constraints from DM relic density, direct/indirect detection, and the collider bounds. These two models are the ones with scalar/pseudoscalar mediator $ \phi $ with $ M_{\phi} \in [1500,3000] $ GeV.