Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 80: Dunkle Materie 4 (indirekte Suche)

T 80.8: Talk

Wednesday, March 26, 2014, 18:30–18:45, P11

Dark matter annihilations and decays after the AMS-02 positron measurements — Alejandro Ibarra¹, •Anna S. Lamperstorfer¹, and Joseph Silk^2,3,4 — ¹Physik-Department T30d, Technische Universität München, James-Franck-Straße, 85748 Garching, Germany — ²Institut d'Astrophysique, UMR 7095 CNRS, Université Pierre et Marie Curie, 98bis Blvd Arago, 75014 Paris, France — ³Department of Physics and Astronomy, The Johns Hopkins University, Homewood Campus, Baltimore MD 21218, USA — ⁴Beecroft Institute of Particle Astrophysics and Cosmology, Department of Physics, University of Oxford, Oxford OX1 3RH, UK

We use the new positron data from the AMS-02 experiment to set limits on dark matter annihilations and decays in different channels. In this work it is assumed that the positron background consists of secondary positrons from spallations and an additional primary component of astrophysical origin. We show that the positron flux and the positron fraction give competitive limits on the dark matter properties. Concretely, we can exclude the thermal cross section for dark matter masses below 100 GeV in the electron channel and for masses below 60 GeV in the muon channel.