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arXiv 1702.02580hep-phastro-ph.HE
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Coy暗物质的Gamma-ray线约束

Gamma-ray line constraints on Coy Dark Matter

Andi Hektor, Luca Marzola, Taavi Tuvi

摘要:

Coy暗物质是一种有效的方案,其中候选的费米子暗物质通过赝标介质与标准模型费米子相互作用。这种简单的设置避免了直接探测实验以自然的方式所带来的强烈约束,并解释了在观测到的暗物质遗迹丰度之上,最近在银河系中心探测到的空间扩展的伽马射线过剩。在这封信中,我们研究的现象coy暗物质占一个新的签名的模型:双光子湮灭信号诱导的标准模型费米子在环路水平。通过挑战的模型与观测的球状矮卫星星系和费米LAT实验获得的伽马射线线搜索的结果,我们评估其兼容性与测得的暗物质遗迹丰度和银河系中心过剩。我们表明,尽管伽马射线线约束排除了所考虑的参数空间的一个重要部分,连接到所观察到的银河系中心过剩的区域仍然是目前可行的。尽管如此,我们发现下一代实验,如DAMPE,HERD和GAMMA-400有可能彻底探测这种难以捉摸的情况。

英文摘要:

Coy dark matter is an effective scheme in which a fermionic dark matter candidate interacts with the Standard Model fermions via a pseudoscalar mediator. This simple setup avoids the strong constraints posed by direct detection experiments in a natural way and explains, on top of the observed dark matter relic abundance, the spatially extended gamma-ray excess recently detected at the Galactic Center. In this Letter we study the phenomenology of coy dark matter accounting for a novel signature of the model: the diphoton annihilation signal induced by the Standard Model fermions at the loop level. By challenging the model with the observations of spheroidal dwarf satellite galaxies and the results of gamma-ray line searches obtained by the Fermi LAT experiment, we assess its compatibility with the measured dark matter relic abundance and the Galactic Center excesses. We show that despite the gamma-ray line constraint rules out a significant fraction of the considered parameter space, the region connected to the observed Galactic Center excess remains currently viable. Nevertheless, we find that next-generation experiments such as DAMPE, HERD and GAMMA-400 have the potential to probe exhaustively this elusive scenario.

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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