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arXiv 1503.04137hep-phastro-ph.CO
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具有辐射驱动自然性的超对称性:对WIMP和轴子搜索的影响

Supersymmetry with radiatively-driven naturalness: implications for WIMP and axion searches

Kyu Jung Bae, Howard Baer, Vernon Barger, Michael R. Savoy, Hasan Serce

摘要:

通过坚持MSSM的电弱和QCD部分的自然性,暗物质产生的图像与通常的WIMP奇迹图像相比有了很大的改变。在具有辐射驱动自然性的超对称模型(辐射自然超对称模型或RNS)中,其中包括对强CP和超对称μ问题的DFSZ类解决方案,暗物质预计将是轴子和希格斯诺类WIMP的混合物。WIMP/轴子丰度计算需要同时求解一组描述准稳定轴子和轴子的耦合玻尔兹曼方程。在大多数的参数空间,轴子弥补了占主导地位的贡献的暗物质,虽然地区的WIMP优势也发生。我们给出了PQ标度f_a的允许范围,并与ADMX轴子探测器在不久的将来预期探测的值进行了比较。我们还显示了WIMP的检测率,这是抑制从通常的期望,因为现在WIMP只包括一小部分的总暗物质。尽管如此,吨级稀有液体探测器应该能够探测整个RNS参数空间。间接的WIMP检测率是不太有利的,因为它们是由耗尽的WIMP丰度的平方减少。

英文摘要:

By insisting on naturalness in both the electroweak and QCD sectors of the MSSM, the portrait for dark matter production is seriously modified from the usual WIMP miracle picture. In SUSY models with radiatively-driven naturalness (radiative natural SUSY or RNS) which include a DFSZ-like solution to the strong CP and SUSY mu problems, dark matter is expected to be an admixture of both axions and higgsino-like WIMPs. The WIMP/axion abundance calculation requires simultaneous solution of a set of coupled Boltzmann equations which describe quasi-stable axinos and saxions. In most of parameter space, axions make up the dominant contribution of dark matter although regions of WIMP dominance also occur. We show the allowed range of PQ scale f_a and compare to the values expected to be probed by the ADMX axion detector in the near future. We also show WIMP detection rates which are suppressed from usual expectations because now WIMPs comprise only a fraction of the total dark matter. Nonetheless, ton-scale noble liquid detectors should be able to probe the entirety of RNS parameter space. Indirect WIMP detection rates are less propitious since they are reduced by the square of the depleted WIMP abundance.

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