Neutral and Millicharged Dark Matter Decay into Gamma-Ray Lines

Abstract

A gamma-ray line observation would be a strong hint towards the detection of dark matter. The possibility that a decay of the dark matter particle is responsible for the emission of a line is investigated, for both a neutral and a millicharged dark matter. We focus here on a comparison of these two scenarios, based on an effective field theory description and relying on cosmic ray continuum constraints.

Comments: 4 pages, 1 figure, 2 tables, Proceedings of the 49th Rencontres de Moriond, Electroweak Interactions and Unified Theories session, March 15th-22nd, 2014, La Thuile, Italy