Paolo Ciafaloni, Denis Comelli, Andrea De Simone, Antonio Riotto, Alfredo Urbano
If the Dark Matter is the neutral Majorana component of a multiplet which is
charged under the electroweak interactions of the Standard Model, its main
annihilation channel is into W+W-, while the annihilation into light fermions
is helicity suppressed. As pointed out recently, the radiation of gauge bosons
from the initial state of the annihilation lifts the suppression and opens up
an s-wave contribution to the cross section. We perform the full tree-level
calculation of Dark Matter annihilations, including electroweak bremsstrahlung,
in the context of an explicit model corresponding to the supersymmetric wino.
We find that the fermion channel can become as important as the di-boson one.
This result has significant implications for the predictions of the fluxes of
particles originating from Dark Matter annihilations.
View original:
http://arxiv.org/abs/1202.0692
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