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We show that the presence of nearby Coulombic resonances at finite energycould lead to the enhancement of the dark matter annihilation cross section atspecific non-zero velocities correlated with the mass splitting between thedark matter pair and that of the resonance. If one of these resonant velocitiesapproximately matches the velocity of dark matter in our local neighbourhood,we would see this enhancement in existing indirect-detection measurements, suchas the measurements of the continuum photon spectrum made by HESS andFermi-LAT. We explore this effect in the context of pure Higgsino and Wino darkmatter with a variable splitting between charged and neutral components,controlled by the Wilson coefficient of a higher-dimension operator. Forelectroweak WIMPs a relevant and appreciable enhancement from Coulombresonances requires tuning the charged-neutral splitting to be of order theCoulomb binding energies. This leads to strong exclusions of Higgsino darkmatter with charged-neutral splittings in the narrow ranges (2, 2.5) and (8.5,10.5) MeV. In contrast, by decreasing the charged-neutral splitting for thethermal Wino, we can move the Yukawa resonance away from the thermal relicmass, decreasing the indirect-detection signal to a level that is compatiblewith HESS measurements in the window (25, 35) MeV.

Boosting the dark matter signal with Coulomb resonances