http://arxiv.org/abs/1901.09992
(Mini) split supersymmetry explains the observed Higgs mass and evades stringent constraints, while keeps good features of TeV-scale supersymmetry other than the little hierarchy problem. Such scenarios naturally predict thermal wino dark matter whose mass is around 3 TeV. Its non-perturbatively enhanced annihilation is a promising target of indirect detection experiments. It is known that identifying the smallest halos is essential for reducing an uncertainty in interpreting indirect detection experiments. Despite its importance, the smallest halos of thermal wino dark matter have not been well understood and thus are investigated in this work. In particular, we remark two aspects: 1) neutral wino is in kinetic equilibrium with primordial plasma predominantly through inelastic processes involving slightly heavier charged wino; and 2) the resultant density contrast shows larger powers at dark acoustic oscillation peaks than in cold dark matter, which is known as an overshooting phenomenon. The latter can enhance a total luminosity of dark matter annihilation in a halo significantly depending on the assumption of the $c$-$M$ relation and the mass function. This work will be an important step to accurately pin down thermal wino dark matter through vigorous efforts in indirect detection experiments.
A. Kamada, T. Sekiguchi and T. Takahashi
Wed, 30 Jan 19
9/54
Comments: 7+6 pages, 6 figures