Gamma-ray triangles: a possible signature of asymmetric dark matter in indirect searches

Understand

We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle.

• This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon.
• The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky.
• Using data from the Fermi-LAT and H.E.S.S.