Sommerfeld enhancement from Goldstone pseudo-scalar exchange

Details Sommerfeld enhancement from Goldstone pseudo-scalar exchange Sommerfeld enhancement from Goldstone pseudo-scalar exchange

2009-07-01

arxiv.org/abs/0907.0235v2

JHEP 0911:046,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 4 figures, v2 includes contact information

Scientific paper

10.1088/1126-6708/2009/11/046

We point out that the exchange of a Goldstone pseudo-scalar can provide an enhancement in the dark matter annihilation rate capable of explaining the excess flux seen in high energy cosmic ray data. The mechanism of enhancement involves the coupling of s and d waves through the tensor force that is very strong and, in fact, singular at short distances. The results indicate that large enhancements require some amount of fine tuning. We also discuss the enhancement due to other singular attractive potentials, such as WIMP models with a permanent electric dipole.

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