DeepCore中级联事例的ν_τ- ν_s混合研究
Exploring ν_τ- ν_s mixing with cascade events in DeepCore
摘要：
IceCube实验及其低能扩展DeepCore收集的大气中微子数据为探测标准模型的中微子部分提供了一个独特的机会。在低能量范围内，实验观察到了中微子振荡，而高能量数据对中微子领域的新物理特征特别敏感。在这种情况下，我们以前证明了实验的无与伦比的潜力，以揭示光无菌中微子的存在。这些研究通常在最简单的3+1模型中进行，集中在TeV能量的μ子中微子的消失，这是它们与无菌中微子混合的结果。在这里，我们扩展这种分析，包括级联事件，是次级电磁和强子簇射产生的中微子的所有口味。我们发现，可以探测3+1模型的完整参数空间，包括贫中微子到τ中微子的弱约束混合。我们表明，$ν_τ-ν_s$混合的结果成一个独特的签名的数据，这将使冰立方获得约束远低于目前的上限。
英文摘要：
The atmospheric neutrino data collected by the IceCube experiment and its low-energy extension DeepCore provide a unique opportunity to probe the neutrino sector of the Standard Model. In the low energy range the experiment have observed neutrino oscillations, and the high energy data are especially sensitive to signatures of new physics in the neutrino sector. In this context, we previously demonstrated the unmatched potential of the experiment to reveal the existence of light sterile neutrinos. The studies are routinely performed in the simplest 3+1 model concentrating on disappearance of muon neutrinos of TeV energy as a result of their mixing with a sterile neutrino. We here extend this analysis to include cascade events that are secondary electromagnetic and hadronic showers produced by neutrinos of all flavors. We find that it is possible to probe the complete parameter space of 3+1 model, including the poorly constrained mixing of the sterile neutrino to tau neutrinos. We show that $ν_τ-ν_s$ mixing results into a unique signature in the data that will allow IceCube to obtain constraints well below the current upper limits.
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