论文标题
黑色存在的中微子地板
The neutrino-floor in the presence of dark radation
论文作者
论文摘要
在这项工作中，我们分析了暗物质直接检测实验的最终灵敏度，即“中微子地板”，在存在SM或半遗传性中微子的暗辐射的异常来源的情况下。假定该通量组件是由暗物质衰减产生的。由于暗辐射可能模仿暗物质信号，因此我们根据可能性统计数据进行分析，该统计范围可以测试信号和背景之间的区分性。我们表明，在存在额外的深色辐射的情况下，可能会取消用于基于氙气实验的中微子地板。此外，我们在直接检测实验中探索了来自暗物质衰减中中微子暗辐射的可检测性。鉴于中微子实验的先前界限，我们发现基于氙气的暗物质搜索将无法探测暗物质祖细胞质量和寿命参数空间的新区域。反过来，如果衰减发生在与重子的相互作用增强的第四个中微子物种中，则DR可以构成主要背景，也可以在直接检测实验中构成可发现的信号。
In this work we analyse the ultimate sensitivity of dark matter direct detection experiments, the "neutrino-floor", in the presence of anomalous sources of dark radiation in form of SM or semi-sterile neutrinos. This flux-component is assumed to be produced from dark matter decay. Since dark radiation may mimic dark matter signals, we perform our analysis based on likelihood statistics that allows to test the distinguishability between signals and backgrounds. We show that the neutrino floor for xenon-based experiments may be lifted in the presence of extra dark radiation. In addition, we explore the testability of neutrino dark radiation from dark matter decay in direct detection experiments. Given the previous bounds from neutrino experiments, we find that xenon-based dark matter searches will not be able to probe new regions of the dark matter progenitor mass and lifetime parameter space when the decay products are SM neutrinos. In turn, if the decay instead happens to a fourth neutrino species with enhanced interactions to baryons, DR can either constitute the dominant background or a discoverable signal in direct detection experiments.
