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

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

2006-05-16

arxiv.org/abs/hep-ph/0605181v1

Phys.Rev. D74 (2006) 015016

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 5 figures

Scientific paper

10.1103/PhysRevD.74.015016

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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