Bell, Nicole F.; Dent, James B.; Galea, Ahmad J.; Jacques, Thomas D.; Krauss, Lawrence; Weiler, Thomas J.
We revisit the calculation of electroweak bremsstrahlung contributions to dark matter annihilation. Dark matter annihilation to leptons is necessarily accompanied by electroweak radiative corrections, in which a W or Z boson is also radiated. Significantly, while many dark matter models feature a helicity suppressed annihilation rate to fermions, bremsstrahlung process can remove this helicity suppression such that the branching ratios Br(ℓνW), Br(ℓ+ℓ-Z), and Br(ν̄νZ) dominate over Br(ℓ+ℓ-) and...[Show more]
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