Indirect searches of dark matter via polynomial spectral features

Understand

We derive the spectra arising from non-relativistic dark matter annihilations or decays into intermediary particles with arbitrary spin, which subsequently produce neutrinos or photons via two-body decays.

• Our approach is model independent and predicts spectral features restricted to a kinematic box.
• The overall shape within that box is a polynomial determined by the polarization of the decaying particle.
• We illustrate our findings with two examples.