Novel Spectral Features in MeV Gamma Rays from Dark Matter
arXiv:1610.04613 · doi:10.1103/PhysRevD.95.043002
Abstract
Astrophysical searches for gamma rays are one of the main strategies to probe the annihilation or decay of dark matter particles. We present a new class of distinct sub-GeV spectral features that generically appear in kinematical situations where the available center-of-mass energy in such processes is just above threshold to produce excited meson states. Using a Fisher forecast with realistic astrophysical backgrounds, we demonstrate that for upcoming experiments like e-ASTROGAM and ComPair these signals can turn out to be the smoking gun in the search for particle dark matter.
arXiv comment7 pages revtex4-1, 5 figures; minor updates in sensitivity figures and discussion. Matches published version
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