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2014

Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess

Abdullah, Mohammad, DiFranzo, Anthony, Rajaraman, Arvind et al.

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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.

Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess · Around

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