Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with 6.6 × 1 0 20 protons on target
Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with 6.6 × 1 0 20 protons on target
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通过 T2K 实验对目标上的 6.6 × 1 0 20 质子进行的中微子振荡测量
DOI：
10.1103/physrevd.91.072010
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发表时间：
2015
影响因子：
5
通讯作者：
Abe K
中科院分区：
文献类型：
--
作者：
Abe K
我们使用2010年至2013年收集的T2K长基线中微子实验数据报告中微子振荡的测量结果。在对μ中微子消失的分析中，我们发现两种可能的质量等级的估计和68%的置信区间为：sin 2 θ23=0.511±0.055和sin 2 θ23=0.511±0.055。分析占中微子相互作用的多核子机制，发现引入可忽略不计的偏见。我们描述了我们的第一个分析，结合联合收割机测量μ中微子消失和电子中微子的外观，估计四个振荡参数，和质量等级。频率和贝叶斯区间的组合，这些参数，包括和不包括最近的反应堆测量。在90%的置信水平，包括反应堆的测量，我们排除了正常的层次和倒置层次的区域。T2K和反应堆数据弱有利于正态层次，贝叶斯因子为2.2。当包括反应堆数据时，其它振荡参数的最可几值和68%的一维可信区间为。
We report on measurements of neutrino oscillation using data from the T2K long-baseline neutrino experiment collected between 2010 and 2013. In an analysis of muon neutrino disappearance alone, we find the following estimates and 68% confidence intervals for the two possible mass hierarchies:andand inverted hierarchy: sin2θ23=0.511±0.055 and. The analysis accounts for multinucleon mechanisms in neutrino interactions which were found to introduce negligible bias. We describe our first analyses that combine measurements of muon neutrino disappearance and electron neutrino appearance to estimate four oscillation parameters,,,,, and the mass hierarchy. Frequentist and Bayesian intervals are presented for combinations of these parameters, with and without including recent reactor measurements. At 90% confidence level and including reactor measurements, we exclude the regionfor normal hierarchy andfor inverted hierarchy. The T2K and reactor data weakly favor the normal hierarchy with a Bayes factor of 2.2. The most probable values and 68% one-dimensional credible intervals for the other oscillation parameters, when reactor data are included, areand.