Mass hierarchy, 2-3 mixing and CP-phase with huge atmospheric neutrino detectors
Mass hierarchy, 2-3 mixing and CP-phase with huge atmospheric neutrino detectors
复制标题
质量等级、2-3 混合和 CP 相，具有巨大的大气中微子探测器
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
A. Smirnov
中科院分区：
文献类型：
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作者：
E. Akhmedov;E. Akhmedov;S. Razzaque;S. Razzaque;A. Smirnov
我们探索了具有低（~ 1 GeV）阈值的兆吨级冰或水切伦科夫探测器的物理潜力。利用提出的PINGU探测器装置的一些特性，我们计算了事件与中微子能量Eν和天顶角θz的分布，并研究了它们对未知中微子参数的依赖关系。在（Eν−θz）区域，分布对中微子质量层次、2-3混合与最大混合的偏差和cp相具有最高的敏感性。我们评估了中微子参数测量的重要性，并探讨了这种重要性与中微子能量和方向重建精度的依赖关系。讨论了参数简并对灵敏度的影响。我们估计了未来探测器的特性（能量和角度分辨率，体积等）需要建立高置信度的中微子质量层次。经过5年的运行，我们发现在3σ-10σ（取决于重建精度）水平上可以识别出层次结构。
A bstractWe explore the physics potential of multi-megaton scale ice or water Cherenkov detectors with low (~ 1 GeV) threshold. Using some proposed characteristics of the PINGU detector setup we compute the distributions of events versus neutrino energy Eν and zenith angle θz , and study their dependence on yet unknown neutrino parameters. The (Eν − θz) regions are identified where the distributions have the highest sensitivity to the neutrino mass hierarchy, to the deviation of the 2-3 mixing from the maximal one and to the CP-phase. We evaluate significance of the measurements of the neutrino parameters and explore dependence of this significance on the accuracy of reconstruction of the neutrino energy and direction. The effect of degeneracy of the parameters on the sensitivities is also discussed. We estimate the characteristics of future detectors (energy and angle resolution, volume, etc.) required for establishing the neutrino mass hierarchy with high confidence level. We find that the hierarchy can be identified at 3σ-10σ level (depending on the reconstruction accuracies) after 5 years of PINGU operation.