论文标题
检测未来水性液体闪烁体检测器Theia的弥漫性超新星中微子背景
Detecting the Diffuse Supernova Neutrino Background in the future Water-based Liquid Scintillator Detector Theia
论文作者
论文摘要
基于水基液体闪烁体（WBL）的大规模中微子天文台将非常适合测量弥漫性超新星中微子背景（DSNB）。 WBLS技术提供了高信号效率和有效抑制大气中微子中性相互作用的压倒性背景。为了说明这一点，我们通过沿完整的分析链开发预期的信号和背景拒绝效率来研究未来Theia检测器的两种配置的DSNB灵敏度。基于对剩余信号和背景速率的统计分析，我们发现190kt $ \ cdot $ yrs相当中等的暴露将足以要求（$5σ$）发现标准模型假设的微弱DSNB信号。我们得出的结论是，与其他实验技术相比，WBL提供了超过80 \％的最高信号效率，并且在背景上提供了最佳信号意义。
A large-scale neutrino observatory based on Water-based Liquid Scintillator (WbLS) will be excellently suited for a measurement of the Diffuse Supernova Neutrino Background (DSNB). The WbLS technique offers high signal efficiency and effective suppression of the otherwise overwhelming background from neutral-current interactions of atmospheric neutrinos. To illustrate this, we investigate the DSNB sensitivity for two configurations of the future Theia detector by developing the expected signal and background rejection efficiencies along a full analysis chain. Based on a statistical analysis of the remaining signal and background rates, we find that a rather moderate exposure of 190kt$\cdot$yrs will be sufficient to claim a ($5σ$) discovery of the faint DSNB signal for standard model assumptions. We conclude that, in comparison with other experimental techniques, WbLS offers the highest signal efficiency of more than 80\% and best signal significance over background.
