标题： 用中微子数据的全局拟合检验中微子物种的数量 显示英文标题

标题： Testing the Number of Neutrino Species with a Global Fit of Neutrino Data

摘要： 我们首次在当前中微子数据的分析中给出了许多额外中微子物种模型的第一个实验限制。 这类模型被提出作为解决等级问题的一种方案，通过将引力的物种尺度降低到TeV。 此外，它们提供了一种自然机制来生成小的中微子质量，并提供了有趣的暗物质候选者。 本研究分析了大亚湾、KamLAND、MINOS、NOvA和KATRIN的数据。 我们没有发现任何额外中微子物种存在的证据，因此报告了自然界中允许的中微子物种数量的下限。 对于正常的/倒置的中微子质量排序，我们可以分别在参数空间的大范围内给出O(30)和O(100)的中微子物种数量下限。 显示英文摘要

摘要： We present the first experimental constraints on models with many additional neutrino species in an analysis of current neutrino data. These types of models are motivated as a solution to the hierarchy problem by lowering the species scale of gravity to TeV. Additionally, they offer a natural mechanism to generate small neutrino masses and provide interesting dark matter candidates. This study analyzes data from DayaBay, KamLAND, MINOS, NOvA and KATRIN. We do not find evidence for the presence of any additional neutrino species, therefore we report lower bounds on the allowed number of neutrino species realized in nature. For the normal/inverted neutrino mass ordering, we can give a lower bound on the number of neutrino species of O(30) and O(100), respectively, over a large range of the parameter space.