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arXiv 1502.06000hep-phastro-ph.HE
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赝标量门暗物质

Pseudoscalar Portal Dark Matter

Asher Berlin, Stefania Gori, Tongyan Lin, Lian-Tao Wang

摘要:

一个费米子暗物质候选者,其残余丰度是通过赝标湮灭而设定的,可以逃避直接探测实验的约束。我们提出了简化的模型,实现这一事实,通过耦合一个费米子暗部门的两个希格斯偶极子模型。这些模型是混合双希格斯诺暗物质在MSSM中的推广,在耦合和标量谱上有更多的自由度。赝标量共振附近的湮灭使得热遗迹暗物质的参数空间比单重态-二重态暗物质大得多,在单重态-二重态中,费米子只与SM希格斯二重态耦合。在一般的双希格斯粒子模型中,赝标量也可以相对较轻,甚至在100 GeV以下也有可能获得热遗迹暗物质候选者。特别是,我们找到了足够的空间来获得质量约为50 GeV的暗物质,并拟合银河系中心多余的伽马射线。这个参数空间区域可以通过LHC寻找重赝标量或电弱子来探测,也可能通过其他新的对撞机信号来探测。

英文摘要:

A fermion dark matter candidate with a relic abundance set by annihilation through a pseudoscalar can evade constraints from direct detection experiments. We present simplified models that realize this fact by coupling a fermion dark sector to a two-Higgs doublet model. These models are generalizations of mixed bino-Higgsino dark matter in the MSSM, with more freedom in the couplings and scalar spectra. Annihilation near a pseudoscalar resonance allows a significant amount of parameter space for thermal relic dark matter compared to singlet-doublet dark matter, in which the fermions couple only to the SM Higgs doublet. In a general two-Higgs doublet model, there is also freedom for the pseudoscalar to be relatively light and it is possible to obtain thermal relic dark matter candidates even below 100 GeV. In particular, we find ample room to obtain dark matter with mass around 50 GeV and fitting the Galactic Center excess in gamma-rays. This region of parameter space can be probed by LHC searches for heavy pseudoscalars or electroweakinos, and possibly by other new collider signals.

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