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QCD Correction to Neutralino Annihilation Process and Dark Matter Density in Supersymmetric Models

Takeo Moroi·Yukinari Sumino·Akira Yotsuyanagi
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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.

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Takeo Moroi, Yukinari Sumino, Akira Yotsuyanagi. 2006-05-16. QCD Correction to Neutralino Annihilation Process and Dark Matter Density in Supersymmetric Models. https://doi.org/10.1103/physrevd.74.015016

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