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Institute for Cosmic Ray Research, Kamioka Observatory, University of Tokyo, Kamioka, Japan.
Department of Physics, Imperial College London, London, United Kingdom.
Phys Rev Lett. 2017 Apr 14;118(15):151801. doi: 10.1103/PhysRevLett.118.151801. Epub 2017 Apr 10.
T2K reports its first results in the search for CP violation in neutrino oscillations using appearance and disappearance channels for neutrino- and antineutrino-mode beams. The data include all runs from January 2010 to May 2016 and comprise 7.482×10^{20} protons on target in neutrino mode, which yielded in the far detector 32 e-like and 135 μ-like events, and 7.471×10^{20} protons on target in antineutrino mode, which yielded 4 e-like and 66 μ-like events. Reactor measurements of sin^{2}2θ_{13} have been used as an additional constraint. The one-dimensional confidence interval at 90% for the phase δ_{CP} spans the range (-3.13, -0.39) for normal mass ordering. The CP conservation hypothesis (δ_{CP}=0, π) is excluded at 90% C.L.
T2K合作组报告了其在中微子振荡中寻找CP破坏的首批结果，使用了中微子和反中微子模式束流的出现和消失道。数据包括2010年1月至2016年5月的所有运行数据，其中中微子模式下靶上质子为7.482×10²⁰个，在远探测器产生了32个电子类事例和135个μ子类事例；反中微子模式下靶上质子为7.471×10²⁰个，产生了4个电子类事例和66个μ子类事例。反应堆对sin²2θ₁₃的测量结果被用作额外的约束条件。对于正常质量排序，CP破坏相位δ₊ₚ的90%一维置信区间为(-3.13, -0.39)。CP守恒假设(δ₊ₚ = 0, π)在90%置信水平下被排除。
