Large contributions to dark matter annihilation from three-body final states

Details Large contributions to dark matter annihilation from three-body final states Large contributions to dark matter annihilation from three-body final states

2010-03-13

arxiv.org/abs/1003.2730v1

Phys.Rev.D81:075024,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages

Scientific paper

10.1103/PhysRevD.81.075024

The annihilation rate of dark matter particles plays a crucial role in dark matter studies, for it determines their relic density and their indirect detection signal. In this paper, we show that this annihilation rate can receive large additional contributions from three-body final states consisting of a real and a virtual massive particle, such as WW* (Wf \bar f') and t \bar t* (tW\bar b). We consider two specific examples, from the singlet model and the MSSM, and find that, due to the new three-body final state contributions, the prediction for the relic density may decrease by more than a factor two, whereas the present dark matter annihilation rate gets enhanced by up to two orders of magnitude. Some of the implications of these results are briefly discussed.

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