Smallest Halos in Thermal Wino Dark Matter. (arXiv:1901.09992v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Kamada_A/0/1/0/all/0/1">Ayuki Kamada</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Sekiguchi_T/0/1/0/all/0/1">Toyokazu Sekiguchi</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Takahashi_T/0/1/0/all/0/1">Tomo Takahashi</a>
(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.
(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.
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