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arXiv 0705.4027hep-phastro-ph
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共湮灭过程的辐射修正

Radiative corrections to co-annihilation processes

A. Freitas

摘要:

在共同湮灭的情况下,弱相互作用暗物质粒子(WIMP)的质量接近另一种粒子,可以衰变成WIMP。因此,这两种粒子在早期宇宙中几乎同时冻结,并且都有助于有效的暗物质湮灭截面。由于较重的粒子不需要弱相互作用,因此共湮灭过程通常会受到相当大的辐射修正。本文以超对称性中的中性子终止共湮灭为例进行了分析。计算了主导QCD修正,发现它们对有效湮灭截面有很大的影响,在参数空间的某些区域可达50%以上。

英文摘要:

In co-annihilation scenarios, the weakly interacting dark matter particle (WIMP) is close in mass to another particle that can decay into the WIMP. As a result, both particles freeze out at roughly the same time in the early universe, and both contribute to the effective dark matter annihilation cross-section. Since the heavier particle does not need to be weakly interacting, the co-annihilation processes are in general subject to sizeable radiative corrections. Here this is analyzed for the example of neutralino-stop co-annihilation in supersymmetry. The leading QCD corrections are calculated and it is found that they have a large effect on the effective annihilation cross-section, reaching more than 50% in some regions of parameter space.

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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