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arXiv 1507.06993hep-ph
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赝标门暗物质和类矢量费米子的新特征

Pseudoscalar Portal Dark Matter and New Signatures of Vector-like Fermions

JiJi Fan, Savvas M. Koushiappas, Greg Landsberg

摘要:

费米子暗物质通过赝标量入口与标准模型扇区相互作用,可以避开直接探测的限制,同时保持WIMP奇迹。我们研究了LHC对简化模型中赝标产生的约束,赝标主要与b夸克或τ轻子耦合,并探讨了它们对伽玛射线观测中GeV过量的影响。我们还研究了新的矢量类费米子模型,可以实现简化模型的赝标门户暗物质。这些模型产生了新的衰变通道和矢量类费米子的特征,例如,bbb,btautau和tautautau共振。一些签名已经受到现有LHC搜索的强烈约束,并且拟合伽马射线过量的参数空间进一步受到限制。另一方面,由于电弱产生率很小,到目前为止,纯的富τ末态仅受到弱约束。

英文摘要:

Fermionic dark matter interacting with the Standard Model sector through a pseudoscalar portal could evade the direct detection constraints while preserving a WIMP miracle. We study the LHC constraints on the pseudoscalar production in simplified models with the pseudoscalar either dominantly coupled to b quarks or tau leptons and explore their implications for the GeV excesses in gamma ray observations. We also investigate models with new vector-like fermions that could realize the simplified models of pseudoscalar portal dark matter. These models yield new decay channels and signatures of vector-like fermions, for instance, bbb, btautau, and tautautau resonances. Some of the signatures have already been strongly constrained by the existing LHC searches and the parameter space fitting the gamma ray excess is further restricted. On the other hand, the pure tau-rich final state is only weakly constrained so far due to the small electroweak production rate.

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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