QCD Correction to Neutralino Annihilation Process and Dark Matter Density in Supersymmetric Models
Takeo Moroi, Yukinari Sumino, Akira Yotsuyanagi
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 tt 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.
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