Initial State Radiation in Majorana Dark Matter Annihilations
High Energy Physics - Phenomenology
2011-10-27 v1
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.
Keywords
Cite
@article{arxiv.1107.4453,
title = {Initial State Radiation in Majorana Dark Matter Annihilations},
author = {Paolo Ciafaloni and Marco Cirelli and Denis Comelli and Andrea De Simone and Antonio Riotto and Alfredo Urbano},
journal= {arXiv preprint arXiv:1107.4453},
year = {2011}
}
Comments
9 pages, 3 figures