Can annihilating Dark Matter be lighter than a few GeVs?

Abstract

We estimate the gamma ray fluxes from the residual annihilations of Dark Matter particles having a mass mdm \in [MeV, O(GeV)] and compare them to observations. We find that particles lighter than O(100 MeV) are excluded unless their cross section is S-wave suppressed.

4 pages. No figure. Values corrected (last column Table.1). Text clarified. Conclusions unchanged

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