arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.08910hep-phastro-ph.CO
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下一代半导体探测器对sub-GeV暗物质的探测灵敏度

Projected sensitivity to sub-GeV dark matter of next-generation semiconductor detectors

Erik Andersson, Alex Bökmark, Riccardo Catena, Timon Emken, Henrik Klein Moberg, Emil Åstrand

摘要:

我们计算的投影灵敏度暗物质(DM)粒子在未来的直接探测实验使用锗和硅半导体目标的亚GeV质量范围。我们使用似然比作为检验统计量,Monte Carlo模拟和背景模型,我们从最近的实验数据中提取的DM-电子相互作用的暗光子模型内执行此计算。我们提出了我们的研究结果中所需的DM-电子散射截面值拒绝的背景只有假设,有利于背景加DM信号假设与统计学意义,$\mathcal{Z}$,对应于3或5个标准差。我们还测试了我们的结论的稳定性下的天体物理参数的变化,在银河系中的DM的本地空间和速度分布。在最好的情况下,当具有$50$ kg-年曝光量的高压锗检测器和具有$1$ kg-年曝光量和$1\times10^{-7}$计数/像素/天暗电流率的CCD硅检测器同时报告DM信号时,我们发现与$\mathcal{Z}=3$相容的最小截面值对于接触相互作用,($\mathcal{Z}=5$)约为$8\times10^{-42}$ cm $^2$($1\times10^{-41}$ cm $^2$),对于长程相互作用,约为$4\times10^{-41}$ cm $^2$($7\times10^{-41}$ cm $^2$)。我们的敏感性研究扩展和完善以前的作品在背景模型,统计方法和治疗的基础天体物理学的不确定性。

英文摘要:

We compute the projected sensitivity to dark matter (DM) particles in the sub-GeV mass range of future direct detection experiments using germanium and silicon semiconductor targets. We perform this calculation within the dark photon model for DM-electron interactions using the likelihood ratio as a test statistic, Monte Carlo simulations, and background models that we extract from recent experimental data. We present our results in terms of DM-electron scattering cross section values required to reject the background only hypothesis in favour of the background plus DM signal hypothesis with a statistical significance, $\mathcal{Z}$, corresponding to 3 or 5 standard deviations. We also test the stability of our conclusions under changes in the astrophysical parameters governing the local space and velocity distribution of DM in the Milky Way. In the best-case scenario, when a high-voltage germanium detector with an exposure of $50$ kg-year and a CCD silicon detector with an exposure of $1$ kg-year and a dark current rate of $1\times10^{-7}$ counts/pixel/day have simultaneously reported a DM signal, we find that the smallest cross section value compatible with $\mathcal{Z}=3$ ($\mathcal{Z}=5$) is about $8\times10^{-42}$ cm$^2$ ($1\times10^{-41}$ cm$^2$) for contact interactions, and $4\times10^{-41}$ cm$^2$ ($7\times10^{-41}$ cm$^2$) for long-range interactions. Our sensitivity study extends and refine previous works in terms of background models, statistical methods, and treatment of the underlying astrophysical uncertainties.

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