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arXiv · 1404.4977

A weighty interpretation of the Galactic Centre excess

Celine Boehm·Matthew J. Dolan·Christopher McCabe
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Abstract

Previous attempts at explaining the gamma-ray excess near the Galactic Centre have focussed on dark matter annihilation directly into Standard Model particles. This results in a preferred dark matter mass of 30-40 GeV (if the annihilation is into b quarks) or 10 GeV (if it is into leptons). Here we show that the gamma-ray excess is also consistent with heavier dark matter particles; in models of secluded dark matter, dark matter with mass up to 76 GeV provides a good fit to the data. This occurs if the dark matter first annihilates to an on-shell particle that subsequently decays to Standard Model particles through a portal interaction. This is a generic process that works in models with annihilation, semi-annihilation or both. We explicitly demonstrate this in a model of hidden vector dark matter with an SU(2) gauge group in the hidden sector.

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Celine Boehm, Matthew J. Dolan, Christopher McCabe. 2014-07-24. A weighty interpretation of the Galactic Centre excess. https://doi.org/10.1103/physrevd.90.023531

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