Sommerfeld enhancement from Goldstone pseudo-scalar exchange
High Energy Physics - Phenomenology
2009-11-18 v2 High Energy Astrophysical Phenomena
Nuclear Theory
Abstract
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.
Keywords
Cite
@article{arxiv.0907.0235,
title = {Sommerfeld enhancement from Goldstone pseudo-scalar exchange},
author = {Paulo F. Bedaque and Michael I. Buchoff and Rashmish K. Mishra},
journal= {arXiv preprint arXiv:0907.0235},
year = {2009}
}
Comments
14 pages, 4 figures, v2 includes contact information