Constraining heavy dark matter with cosmic-ray antiprotons.
Cosmic-ray observations provide a powerful probe of dark matter annihilation in the Galaxy. In this paper we derive constraints on heavy dark matter from the recent precise AMS-02 antiproton data. We consider all possible annihilation channels into pairs of standard model particles. Furthermore, we interpret our results in the context of minimal dark matter, including higgsino, wino and quintuplet dark matter. We compare the cosmic-ray limits to limits from $\gamma$-ray observations of dwarf spheroidal galaxies and, for the specific case of minimal dark matter, to limits from $\gamma$-line observations of the Galactic center. While the latter limit is highly dependent on the dark matter density distribution and only excludes a thermal wino for cuspy profiles, the cosmic-ray limits are more robust, strongly disfavoring the thermal wino dark matter scenario even for a conservative estimate of systematic uncertainties.
Publisher URL: http://arxiv.org/abs/1711.05274
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