Mar. 07/03/2017 14:00 Grande Ourse, Bâtiment 13, Etage 1 (à confirmer)
WINKLER Martin (Nordita, Stockholm) On the origin of high energy antiprotons in cosmic rays
(LUPM/Interactions fondamentales, Astroparticules et Cosmologie)
Cosmic ray antiprotons provide a powerful tool to search for dark matter annihilations in our galaxy. The latest precision measurement by AMS-02 has revealed a surprisingly hard antiproton spectrum at high energy. While this has triggered speculations about a dark matter signal, it could also hint at an underestimated antiproton background. I will use the latest collider data to update the production of antiprotons in scattering of cosmic ray protons on the interstellar matter. This will allow me to identify a substantial increase of the cross section with energy which is driven by the violation of Feynman scaling. I discuss the impact on the antiproton spectrum and whether this effect can reconcile the AMS-02 data with a pure secondary origin of antiprotons in cosmic rays.
Pour plus d'informations, merci de contacter Lavalle J.