2006/05/16 by Takeo Moroi, Y. Sumino, Yukinari Sumino +1 · 2 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.74.015016
published as Phys.Rev. D74 (2006) 015016 · 19 pages, 5 figures
arxiv created 2006/05/16 · openalex publication_date 2006/07/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 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.