QCD Correction to Neutralino Annihilation Process and Dark Matter Density in Supersymmetric Models
arXiv:hep-ph/0605181 · doi:10.1103/PhysRevD.74.015016
Abstract
We calculate QCD correction to the neutralino annihilation cross section into quark anti-quark final state and discuss its implications to the calculation of neutralino relic density. We see that the QCD correction enhances the pair-annihilation cross section by O(10 %) when final-state quarks are non-relativistic. Consequently, when the lightest neutralinos dominantly annihilate into a t\bar{t} pair, the relic density of the lightest neutralino is significantly affected by the QCD correction, in particular when the lightest-neutralino mass is close to the top-quark mass.
19 pages, 5 figures
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