Resonant Annihilation of WIMP Dark Matter for Halo Gamma Ray Signal

TL;DR

This paper explores a resonant annihilation mechanism for WIMP dark matter to explain gamma ray signals from the Milky Way halo, reconciling observational data with theoretical models.

Contribution

It introduces a model-independent analysis of resonant WIMP annihilation and proposes a simple particle physics model to support it.

Findings

Resonant annihilation can match gamma ray signals with relic density constraints.

A specific parameter space for WIMP mass and resonance conditions is identified.

A viable particle physics model supporting the resonance mechanism is presented.

Abstract

We propose a resonant annihilation as a way to reconcile the WIMP annihilation cross sections in a recently reported gamma ray signal from the Milky Way halo with that for the freeze-out and the upper limit from dwarf galaxies. We perform a simple model-independent analysis based on this hypothesis and determine the required parameters. We also present a simple particle-physics model that can accommodate them.