AMS-02 antiprotons, at last! Secondary astrophysical component and immediate implications for Dark Matter

Gaëlle Giesen , Mathieu Boudaud (1) , Yoann Genolini (1) , Vivian Poulin (1) , Marco Cirelli (2) , Pierre Salati (1, 3) , Pasquale D. Serpico (1)

1 LAPTH - Laboratoire d'Annecy-le-Vieux de Physique Théorique
2 IPHT - Institut de Physique Théorique - UMR CNRS 3681
3 IUF - Institut universitaire de France

Using the updated proton and helium fluxes just released by the AMS-02 experiment we reevaluate the secondary astrophysical antiproton to proton ratio and its uncertainties, and compare it with the ratio preliminarly reported by AMS-02. We find no unambiguous evidence for a significant excess with respect to expectations. Yet, some preference for a flatter energy dependence of the diffusion coefficient starts to emerge. Also, we provide a first assessment of the room left for exotic components such as Galactic Dark Matter annihilation or decay, deriving new stringent constraints.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Gaëlle Giesen, Mathieu Boudaud, Yoann Genolini, Vivian Poulin, Marco Cirelli, et al.. AMS-02 antiprotons, at last! Secondary astrophysical component and immediate implications for Dark Matter. Journal of Cosmology and Astroparticle Physics, 2015, 2015 (09), ⟨10.1088/1475-7516/2015/09/023⟩. ⟨cea-01221167⟩