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research article
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.
Type
research article
Web of Science ID
WOS:000296767600034
Authors
Ciafaloni, Paolo
•
Cirelli, Marco
•
Comelli, Denis
•
De Simone, Andrea
•
Riotto, Antonio
•
Urbano, Alfredo
Publication date
2011
Published in
Start page
034
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
December 16, 2011
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