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University of Tokyo, Institute for Cosmic Ray Research, Kamioka Observatory, Kamioka, Japan.
University of Tokyo, Institute for Cosmic Ray Research, Research Center for Cosmic Neutrinos, Kashiwa, Japan.
Phys Rev Lett. 2020 Apr 24;124(16):161802. doi: 10.1103/PhysRevLett.124.161802.
Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced antineutrino beam, using additional neutrino beam operation to constrain parameters of the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. T2K observes 15 candidate electron antineutrino events with a background expectation of 9.3 events. Including information from the kinematic distribution of observed events, the hypothesis of no electron antineutrino appearance is disfavored with a significance of 2.40σ and no discrepancy between data and PMNS predictions is found. A complementary analysis that introduces an additional free parameter which allows non-PMNS values of electron neutrino and antineutrino appearance also finds no discrepancy between data and PMNS predictions.
T2K实验在加速器产生的反中微子束中测量电子反中微子的出现情况，利用额外的中微子束运行来约束庞蒂科夫-牧-中川-坂田（PMNS）混合矩阵的参数。T2K观测到15个候选电子反中微子事件，背景预期为9.3个事件。纳入观测事件运动学分布的信息后，电子反中微子不出现的假设在2.40σ的显著性水平上被否定，且未发现数据与PMNS预测之间存在差异。一项引入额外自由参数的补充分析允许电子中微子和反中微子出现的非PMNS值，同样未发现数据与PMNS预测之间存在差异。
