Abstract

NOvA is a neutrino experiment deployed at Fermi National Accelerator Laboratory (FNAL, USA) and designed for studying oscillations—namely, the appearance of electron neutrinos and the survival of muon neutrinos. Two detectors, a near and a far one, are separated by a distance of 810 km and are positioned at an angle of 14 mrad with respect to the axis of a beam from the NuMI accelerator complex. This configuration provides an optimum relationship between the energy and distance for neutrino oscillations. The experiment is aimed at measuring the neutrino mass hierarchy, determining the phase of \(CP\) violation in the lepton sector, and refining value of the parameters \(\theta_{23}\) and \(\Delta m^{2}_{32}\), as well as at performing some other tasks. The results of the NOvA analysis performed jointly for a \(8.85\times 10^{20}\) proton-on-target (POT) neutrino beam and a \(12.33\times 10^{20}\) POT antineutrino beams are discussed. Also, further prospects of the experiment are outlined.

中文翻译：

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NOvA实验中中微子振荡的研究

摘要

NOvA是在费米国家加速器实验室（FNAL，美国）部署的中微子实验，旨在研究振荡，即电子中微子的出现和μ子中微子的存活。两个探测器，一个近距离和一个远距离，相距810 km，并相对于NuMI加速器复合体的光束轴以14 mrad的角度定位。这种配置为中微子振荡提供了能量和距离之间的最佳关系。该实验旨在测量中微子质量层次，确定轻子区域中\（CP \）违反的相位，并细化参数\（\ theta_ {23} \）和\（\ Delta m ^ {2 } _ {32} \），以及执行其他一些任务。对\（8.85×10 ^ {20} \）质子对靶（POT）中微子束和\（12.33×10 ^ {20} \） POT中微子束共同进行的NOvA分析结果为讨论过。此外，还概述了该实验的进一步前景。