Implications for dark matter annihilation from the AMS-02 p/p ratio

2015/04/27 by Lin, Su-Jie, Bi, Xiao-Jun, Yin, Peng-Fei +1
#FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.1504.07230

Abstract

The AMS-02 collaboration has just released the cosmic antiproton to proton ratio p/p with a high precision up to ∼ 450 GeV. In this work, we calculate the secondary antiprotons generated by cosmic ray interactions with the interstellar medium taking into account the uncertainties from the cosmic ray propagation. The p/p ratio predicted by these processes shows some tension with the AMS-02 data in some regions of propagation parameters, but the excess is not significant. We then try to derive upper bounds on the dark matter annihilation cross section from the p/p data or signal regions favored by the data. It is shown that the constraint derived by the AMS-02 data is similar to that from Fermi-LAT observations of dwarf galaxies. The signal region for dark matter is usually required m_χ∼ O(10) TeV and \simO(10^-23)~\cm³~\sec^-1.

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