Apr 18 – 22, 2011
Palais des Papes, Avignon
Europe/Paris timezone

Gamma-Ray Lines from Radiative Dark Matter Decay

Apr 21, 2011, 5:45 PM
Chambre du Trésorier (Palais des Papes, Avignon)

Chambre du Trésorier

Palais des Papes, Avignon


David Tran (Technical University of Munich)


The decay of dark matter particles which are coupled predominantly to charged leptons has been proposed as a possible origin of excess high-energy positrons and electrons observed by cosmic-ray telescopes PAMELA and Fermi LAT. Even though the dark matter itself is electrically neutral, the tree-level decay of dark matter into charged lepton pairs will generically induce radiative two-body decays of dark matter at the quantum level. Using an effective theory of leptophilic dark matter decay, we calculate the rates of radiative two-body decays for scalar and fermionic dark matter particles. Due to the absence of astrophysical sources of monochromatic gamma rays, the observation of a line in the diffuse gamma-ray spectrum would constitute a strong indication of a particle physics origin of these photons. We estimate the intensity of the gamma-ray line that may be present in the energy range of a few TeV if the dark matter decay interpretation of the leptonic cosmic-ray anomalies is correct and comment on observational prospects of present and future Imaging Cherenkov Telescopes, in particular the CTA.

Primary authors

Alejandro Ibarra (Technical University of Munich) Christoph Weniger (Max Planck Institute for Physics) David Tran (Technical University of Munich) Mathias Garny (Technical University of Munich)

Presentation materials