PINGU对中微子质量等级的灵敏度
PINGU Sensitivity to the Neutrino Mass Hierarchy
摘要：
中微子质量等级是中微子领域中为数不多的未知参数之一，因此是实验界的主要焦点。精确冰立方下一代升级（PINGU）实验将与南极冰川深处的冰立方DeepCore探测器共同定位，旨在提供质量等级的第一次明确测量。我们已经进行了可行性研究的检测器设计，证明了一个严格限制的灵敏度，每年2.1西格玛到3.4西格玛的层次是可能的，这取决于检测器的几何形状（20至40串）和分析效率。首先，系统和理论的不确定性的影响的研究表明，对层次结构的整体敏感性的影响有限。假设在2016/17年南方夏季部署第一批阵元，预计2020年PINGU将对该层次进行3西格玛测量。
英文摘要：
The neutrino mass hierarchy is one of the few remaining unknown parameters in the neutrino sector and hence a primary focus of the experimental community. The Precision IceCube Next Generation Upgrade (PINGU) experiment, to be co-located with the IceCube DeepCore detector in the deep Antarctic glacier, is being designed to provide a first definitive measurement of the mass hierarchy. We have conducted feasibility studies for the detector design that demonstrate a statistically-limited sensitivity to the hierarchy of 2.1 sigma to 3.4 sigma per year is possible, depending on the detector geometry (20 to 40 strings) and analysis efficiencies. First studies of the effects of systematic and theoretical uncertainties show limited impact on the overall sensitivity to the hierarchy. Assuming deployment of the first array elements in the 2016/17 austral summer season a 3 sigma measurement of the hierarchy is anticipated with PINGU in 2020.
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