Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess   We present simplified models for the galactic center gamma-ray excess where
Dirac dark matter annihilates into pairs or triplets of on-shell bosonic
mediators to the Standard Model. These annihilation modes allow the dark matter
mass to be heavier than those of conventional effective theories for the
gamma-ray excess. Because the annihilation rate is set by the dark
matter--mediator coupling, the Standard Model coupling can be made
parametrically small to `hide' the dark sector by suppressing direct detection
and collider signals. We explore the viability of these models as a thermal
relic and on the role of the mediators for controlling the gamma-ray spectral
shape. We comment on ultraviolet completions for these simplified models and
novel options for Standard Model final states.

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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom