W/Z bremsstrahlung as the dominant annihilation channel for dark matter, revisited
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]
|Collections||ANU Research Publications|
|Source:||Physics Letters B|
|01_Bell_W/Z_bremsstrahlung_as_the_2011.pdf||247.53 kB||Adobe PDF|
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