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arXiv 1601.04718hep-phastro-ph.HE
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MSSM中类似葡萄酒的暗物质的遗迹密度

Relic density of wino-like dark matter in the MSSM

M. Beneke, A. Bharucha, F. Dighera, C. Hellmann, A. Hryczuk, S. Recksiegel, P. Ruiz-Femenia

摘要:

由于索末菲效应的影响,MSSM中TeV级类似维诺的中性伴子暗物质的遗迹密度可能会受到很大的修正。最近开发的框架,使我们能够计算在一般MSSM方案的Sommerdos增强的遗物密度,适当地处理混合状态和多个共湮灭通道,以及包括非对角贡献。使用这个框架,包括对壳单圈质量分裂和运行耦合,并考虑到最新的实验约束,我们进行了彻底的研究周围的区域参数空间的著名的pure-wino方案:即影响的sfermion质量是非去耦和允许不可忽略的希格斯诺或比诺组件中最轻的中性伴子。我们进一步进行调查的热修正的影响,并表明,这些可以安全地忽略不计。结果揭示了一些现象学上有趣的,但到目前为止尚未探索的领域,索末菲效应是相当大的。我们发现,特别是,遗迹密度可以同意与实验占主导地位的维诺中性伴子暗物质的质量范围从1.7到超过4 TeV。根据这些结果,应该重新审视间接探测类酒暗物质的界限。

英文摘要:

The relic density of TeV-scale wino-like neutralino dark matter in the MSSM is subject to potentially large corrections as a result of the Sommerfeld effect. A recently developed framework enables us to calculate the Sommerfeld-enhanced relic density in general MSSM scenarios, properly treating mixed states and multiple co-annihilating channels as well as including off-diagonal contributions. Using this framework, including on-shell one-loop mass splittings and running couplings and taking into account the latest experimental constraints, we perform a thorough study of the regions of parameter space surrounding the well known pure-wino scenario: namely the effect of sfermion masses being non-decoupled and of allowing non-negligible Higgsino or bino components in the lightest neutralino. We further perform an investigation into the effect of thermal corrections and show that these can safely be neglected. The results reveal a number of phenomenologically interesting but so far unexplored regions where the Sommerfeld effect is sizeable. We find, in particular, that the relic density can agree with experiment for dominantly wino neutralino dark matter with masses ranging from 1.7 to beyond 4 TeV. In light of these results the bounds from Indirect Detection on wino-like dark matter should be revisited.

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