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arXiv · 1404.6528

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

Mohammad Abdullah·Anthony DiFranzo·Arvind Rajaraman·Tim M. P. Tait·Philip Tanedo·Alexander M. Wijangco
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Abstract

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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Mohammad Abdullah, Anthony DiFranzo, Arvind Rajaraman, Tim M. P. Tait, Philip Tanedo, Alexander M. Wijangco. 2014-08-28. Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess. https://doi.org/10.1103/physrevd.90.035004

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