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.

10 pages, 6 figures, submitted to Proceedings of the 18th International Conference From the Planck Scale to the Electroweak Scale (2015)

References in corpus (8)

• Cosmology and Astrophysics of Minimal Dark Matter
• Non-perturbative Effect on Thermal Relic Abundance of Dark Matter
• micrOMEGAs4.1: two dark matter candidates
• Neutralino Dark Matter at 14 and 100 TeV
• Search for disappearing tracks in proton-proton collisions at sqrt(s) = 8 TeV
• Gamma ray tests of Minimal Dark Matter
• Minimal semi-annihilating ${\mathbb{Z}}_N$ scalar dark matter
• A Detailed Look at the First Results from the Large Underground Xenon (LUX) Dark Matter Experiment