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Paper detail

Initial State Radiation in Majorana Dark Matter Annihilations

The cross section for a Majorana Dark Matter particle annihilating into light fermions is helicity suppressed. We show that, if the Dark Matter is the neutral Majorana component of a multiplet which is charged under the electroweak interactions of the Standard Model, the emission of gauge bosons from the initial state lifts the suppression and allows an s-wave annihilation. The resulting energy spectra of stable Standard Model particles are importantly affected. This has an impact on indirect searches for Dark Matter.

preprint2011arXivOpen access
Paolo CiafaloniMarco CirelliDenis ComelliAndrea De SimoneAntonio RiottoAlfredo Urbano
hep-ph
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Paolo CiafaloniMarco CirelliDenis ComelliAndrea De SimoneAntonio RiottoAlfredo Urbano

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