We calculate QCD correction to the neutralino annihilation cross section into quark antiquark 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 nonrelativistic. Consequently, when the lightest neutralinos dominantly annihilate into a tt̄ 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.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2006|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)