Speaker
Description
We study the AMS-02 antiproton/proton ratio spectral-measurement in light of the recent advances done in parametrizing the impact of solar modulation of cosmic-rays, the antiproton production uncertainties from inelastic proton-proton collisions in the Galaxy as well as the interstellar medium uncertainties that pertain to the propagation of cosmic-rays in the Milky Way. We confirm previous claims on a GeV bump in antiprotons. Including all the relevant astrophysical uncertainties there is a ~3 sigma significance of a feature in the antiproton/proton ratio that if interpreted as a signal of dark matter annihilation, it would be suggestive of a 50-100 GeV dark matter particle with a partial annihilation cross-section to hadrons that is in the range of $\sigma v : 1-10\times10^{-26}$ cm$^{3}$/s. We also discuss the impact that the recent discovery of anti-helium 3 and 4 nuclei by AMS-02 has on the dark matter searches in antimatter cosmic-rays.
