Semi-Annihilating Wino-Like Dark Matter
Abstract
Semi-annihilation is a generic feature of dark matter theories with symmetries larger than Z_2. We explore a model based on a Z_4-symmetric dark sector comprised of a scalar singlet and a "wino"-like fermion SU(2)_L triplet. This is the minimal example of semi-annihilation with a gauge-charged fermion. We study the interplay of the Sommerfeld effect in both annihilation and semi-annihilation channels. The modifications to the relic density allow otherwise-forbidden regions of parameter space and can substantially weaken indirect detection constraints. We perform a parameter scan and find that the entire region where the model comprises all the observed dark matter is accessible to current and planned direct and indirect searches.
Cite
@article{arxiv.1510.02179,
title = {Semi-Annihilating Wino-Like Dark Matter},
author = {Andrew P. Spray and Yi Cai},
journal= {arXiv preprint arXiv:1510.02179},
year = {2015}
}
Comments
10 pages, 6 figures, submitted to Proceedings of the 18th International Conference From the Planck Scale to the Electroweak Scale (2015)