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The annihilation of TeV-scale leptophilic dark matter into electron-positronpairs (hereafter $e^+e^-$) will produce a sharp cutoff in the local cosmic-ray$e^+e^-$ spectrum at an energy matching the dark matter mass. At these highenergies, $e^+e^-$ cool quickly due to synchrotron interactions with magneticfields and inverse-Compton scattering with the interstellar radiation field.These energy losses are typically modelled as a continuous process. However,inverse-Compton scattering is a stochastic energy-loss process whereinteractions are rare but catastrophic. We show that when inverse-Comptonscattering is modelled as a stochastic process, the expected $e^+e^-$ flux fromdark matter annihilation is about a factor of $\sim$2 larger near the darkmatter mass than in the continuous model. This greatly enhances thedetectability of heavy dark matter annihilating to $e^+e^-$ final states.

Accurate Inverse-Compton Models Strongly Enhance Leptophilic Dark Matter Signals