Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
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.
Keywords
Cite
@article{arxiv.1404.6528,
title = {Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess},
author = {Mohammad Abdullah and Anthony DiFranzo and Arvind Rajaraman and Tim M. P. Tait and Philip Tanedo and Alexander M. Wijangco},
journal= {arXiv preprint arXiv:1404.6528},
year = {2014}
}
Comments
21 pages + appendix + references, 11 figures, 3 tables. v2: minor revisions, additional figure and table for clarity, references added. v3: copyedit corrections, update references