Neutralino annihilation into gluons.
Neutralino annihilation into gluons.
复制标题
中子湮灭成胶子。
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. Nojiri
中科院分区：
文献类型：
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作者：
M. Drees;G. Jungman;M. Kamionkowski;M. Nojiri
本文给出了中性伴子湮灭到双胶子末态的截面的完整计算。这个通道对于中性伴子湮灭的现象学来说是非常重要的，因为中性伴子湮灭为轻夸克和轻子的过程中存在着众所周知的螺旋度抑制。此外，我们还计算了中性伴子湮灭成胶子和夸克-反夸克对的截面，并讨论了QCD对中性伴子湮灭成夸克的树能级截面的修正。如果中性伴子比顶夸克轻，这些结果对太阳和地球中中性伴子湮灭产生的高能中微子信号的影响可能是显著的，特别是如果中性伴子主要是高根伴子。另一方面，我们的结果对中性伴子宇宙学丰度的计算应该没有什么影响。我们还简要讨论了银河系晕中中性伴子湮灭对宇宙射线反质子的影响。
We present a complete calculation of the cross section for neutralino annihilation into the two-gluon final state. This channel can be quite important for the phenomenology of neutralino annihilation due to the well-known helicity suppression of neutralino annihilation into light quarks and leptons. In addition, we calculate the cross section for annihilation of neutralinos into a gluon and quark-antiquark pair, and discuss QCD corrections to the tree-level cross sections for neutralino annihilation into quarks. If the neutralino is lighter than the top quark, the effect of these results on high-energy neutrino signals from neutralino annihilation in the Sun and in the Earth can be significant, especially if the neutralino is primarily gaugino. On the other hand, our results should have little effect on calculations of the cosmological abundance of neutralinos. We also briefly discuss implications for cosmic-ray antiprotons from neutralino annihilation in the galactic halo.