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26 April 2024

» arxiv » 1107.4453

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Initial State Radiation in Majorana Dark Matter Annihilations
Paolo Ciafaloni ; Marco Cirelli ; Denis Comelli ; Andrea De Simone ; Antonio Riotto ; Alfredo Urbano ;
Date:	22 Jul 2011
Abstract:	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.
Source:	arXiv, 1107.4453
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