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
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DOI：
10.1103/physrevd.74.015016
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发表时间：
2006-05
影响因子：
5
通讯作者：
T. Moroi;Y. Sumino;Akira Yotsuyanagi
中科院分区：
文献类型：
--
作者：
T. Moroi;Y. Sumino;Akira Yotsuyanagi
我们计算了中性伴子湮灭到夸克-反夸克末态截面的QCD修正，并讨论了它对中性伴子残余密度计算的意义。我们看到，当末态夸克是非相对论性的时，QCD修正使对湮灭截面增加了O（10%）。因此，当最轻的中性伴子主要湮灭成$t\overline{t}$对时，最轻的中性伴子的残余密度受到QCD修正的显著影响，特别是当最轻的中性伴子质量接近顶夸克质量时。
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 $t\overline{t}$ 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.