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arXiv 1102.4295hep-ph
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标量粒子的索末菲增强及其在sfermion共湮没区的应用

The Sommerfeld enhancement for scalar particles and application to sfermion co-annihilation regions

Andrzej Hryczuk

摘要:

我们研究了索末菲增强效应对最轻中性伴子热遗迹密度的影响。适当的方式,包括索末菲效应在这种情况下进行了讨论,并提供了适当的公式与一组粒子与任意质量和(非)对角相互作用的一般情况。我们实现这些结果来计算mSUGRA框架中的中性伴子sfermion共湮灭区域的遗迹密度。我们发现不可忽略的影响,在整个sfermion共湮灭制度。对于stau共同湮灭的修正的遗迹密度是百分之几的顺序,而停止共同湮灭是大得多,达到一个因素的5在某些地区的参数空间。一个数值包计算的中性伴子遗迹密度,包括索末菲效应在一般MSSM设置公开。

英文摘要:

We study the impact of the Sommerfeld enhancement on the thermal relic density of the lightest neutralino in the case of large co-annihilation effects with a scalar particle. The proper way of including the Sommerfeld effect in this case is discussed, and the appropriate formulas for a general scenario with a set of particles with arbitrary masses and (off-)diagonal interactions are provided. We implement these results to compute the relic density in the neutralino sfermion co-annihilation regions in the mSUGRA framework. We find non-negligible effects in whole sfermion co-annihilation regimes. For stau co-annihilations the correction to the relic density is of the order of several per cent, while for stop co-annihilations is much larger, reaching a factor of 5 in some regions of the parameter space. A numerical package for computing the neutralino relic density including the Sommerfeld effect in a general MSSM setup is made public available.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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