Prospects to find dark matter with cosmic-ray antiprotons and antideuterons
Cosmic rays are one important tool to study dark matter annihilation in our Galaxy. Recently, a possible hint for dark matter annihilation was found in the antiproton spectrum measured by AMS-02. The potential signal is affected by many theoretical and systematic uncertainties making its validation or exclusion a non-trivial task. The most direct but complementary way to test the dark matter interpretation would be the observation of low-energy antinuclei in cosmic rays. We determine the chances to detect antideuterons with GAPS or AMS-02, and the implications on the ongoing AMS-02 antihelium searches. We find that the corresponding antideuteron signal is within GAPS and AMS-02 sensitivity. If, more conservatively, the putative signal is considered as an upper limit on the dark matter annihilation cross section, our results indicate the highest possible fluxes for antideuterons and antihelium compatible with the latest antiproton data.