Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-12-21
Physics
High Energy Physics
High Energy Physics - Phenomenology
39 pages, 10 figures; minor changes, matches published version
Scientific paper
We study in this paper the scenario where the dark matter is constituted by Majorana particles which couple to a light Standard Model fermion and an extra scalar via a Yukawa coupling. In this scenario, the annihilation rate into the light fermions with the mediation of the scalar particle is strongly suppressed by the mass of the fermion. Nevertheless, the helicity suppression is lifted by the associated emission of a gauge boson, yielding annihilation rates which could be large enough to allow the indirect detection of the dark matter particles. We perform a general analysis of this scenario, calculating the annihilation cross section of the processes \chi\chi\rightarrow f\bar f V when the dark matter particle is a SU(2)_L singlet or doublet, f is a lepton or a quark, and V is a photon, a weak gauge boson or a gluon. We point out that the annihilation rate is particularly enhanced when the dark matter particle is degenerate in mass to the intermediate scalar particle, which is a scenario barely constrained by collider searches of exotic charged or colored particles. Lastly, we derive upper limits on the relevant cross sections from the non-observation of an excess in the cosmic antiproton-to-proton ratio measured by PAMELA.
Garny Mathias
Ibarra Alejandro
Vogl Stefan
No associations
LandOfFree
Dark matter annihilations into two light fermions and one gauge boson: general analysis and antiproton constraints does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dark matter annihilations into two light fermions and one gauge boson: general analysis and antiproton constraints, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark matter annihilations into two light fermions and one gauge boson: general analysis and antiproton constraints will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-305246