Speaker: Dr. Xiaoyuan HUANG, Niels Bohr Institute, Copenhagen University

Title: AMS-02 Positron Excess and Three‐body Decaying Dark Matter

Abstract:
Due to the softer energy spectra from the three-body decay, such models could potentially explain the AMS-02 positron excess without being constrained by the Fermi-LAT gamma-ray data and the cosmic ray anti-proton measurements.  We scrutinize over different final state fermions, paying special attention to handling of the cosmic ray background and including various contributions from cosmic ray propagation with the help of the LikeDM package.  It is found that primary decays into an electron-positron pair and a stable neutral particle could give rise to the AMS-02 positron excess and, at the same time, stay unscathed against the gamma-ray and anti-proton constraints.  Decays to a muon pair or a mixed flavor electron-muon pair may also be viable depending on the propagation models.  Decays to all other standard model fermions are severely disfavored.

Time: Dec 27 (Tue) 2:30PM
Venue: Physics Building room 323