We consider the annihilation into gamma rays of Minimal Dark Matter candidates in the fermionic 5-plet and scalar 7-plet representations of SU(2)L, taking into account both the Sommerfeld effect and the internal bremsstrahlung. Assuming the Einasto profile, we show that present measurements of the Galactic Center by the H.E.S.S. instrument exclude the 5-plet and 7-plet as the dominant form of dark matter for masses between 1 TeV and 20 TeV, in particular, the 5-plet mass leading to the observed dark matter density via thermal freeze-out. We also discuss prospects for the upcoming Cherenkov Telescope Array, which will be able to probe even heavier dark matter masses, including the scenario where the scalar 7-plet is thermally produced.
@article{arxiv.1507.05536,
title = {Gamma-rays from Heavy Minimal Dark Matter},
author = {Camilo Garcia-Cely and Alejandro Ibarra and Anna S. Lamperstorfer and Michel H. G. Tytgat},
journal= {arXiv preprint arXiv:1507.05536},
year = {2015}
}
Comments
27 pages, 8 figures. Matches the version accepted for publication by JCAP