论文标题

连贯,直接检测和早期宇宙时的暗物质 - 中断互连

Dark Matter-Neutrino Interconversion at COHERENT, Direct Detection, and the Early Universe

论文作者

Hurtado, Nicholas, Mir, Hana, Shoemaker, Ian M., Welch, Eli, Wyenberg, Jason

论文摘要

我们研究了一个暗物质(DM)模型,其中主要耦合与标准模型通过中微子-DM-Scalar耦合发生。新的Singlet标量通常将与可重新分解的Higgs门户相互作用引起的核/电子耦合。结果,DM粒子$ x $可以通过在目标核上散射$ \ mathcal {n} $转换为中微子:$ x + x + \ \ \ \ \ \ \ \ \ mathcal {n} \rightArrowν + \rightarrowν + \ mathcal {n} $,导致直接检测实验的引人注目的签名。同样,可以在中微子实验的中微子散射事件中产生DM:$ν + \ \ \ Mathcal {n} \ rightArrow x + \ Mathcal {n} $,预测相干等实验的光谱畸变。此外,该模型允许对暗物质的晚期动力学脱钩,对小规模结构有影响。在低质量下,我们发现连贯和晚期的动力学脱钩会在模型上产生最强的约束,而在高质量下,主要限制因素来自Xenon1t和Borexino的DM下散射。未来的改进将来自CE $ν$ ns数据,超低阈值直接检测和稀有的kaon衰变。

We study a Dark Matter (DM) model in which the dominant coupling to the standard model occurs through a neutrino-DM-scalar coupling. The new singlet scalar will generically have couplings to nuclei/electrons arising from renormalizable Higgs portal interactions. As a result the DM particle $X$ can convert into a neutrino via scattering on a target nucleus $\mathcal{N}$: $ X + \mathcal{N} \rightarrow ν+ \mathcal{N}$, leading to striking signatures at direct detection experiments. Similarly, DM can be produced in neutrino scattering events at neutrino experiments: $ ν+ \mathcal{N} \rightarrow X + \mathcal{N}$, predicting spectral distortions at experiments such as COHERENT. Furthermore, the model allows for late kinetic decoupling of dark matter with implications for small-scale structure. At low masses, we find that COHERENT and late kinetic decoupling produce the strongest constraints on the model, while at high masses the leading constraints come from DM down-scattering at XENON1T and Borexino. Future improvement will come from CE$ν$NS data, ultra-low threshold direct detection, and rare kaon decays.

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