Gamma-Ray Lines from Radiative Dark Matter Decay - High Energy Physics - PhenomenologyReport as inadecuate

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

Author: Mathias Garny, Alejandro Ibarra, David Tran, Christoph Weniger


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