Status of neutrino oscillations 2018: 3σ hint for normal mass ordering and improved CP sensitivity
Status of neutrino oscillations 2018: 3σ hint for normal mass ordering and improved CP sensitivity
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DOI：
10.1016/j.physletb.2018.06.019
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发表时间：
2017-08
影响因子：
4.4
通讯作者：
P. F. D. Salas;D. V. Forero;D. V. Forero;C. A. Ternes;M. Tórtola;J. Valle
中科院分区：
文献类型：
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作者：
P. F. D. Salas;D. V. Forero;D. V. Forero;C. A. Ternes;M. Tórtola;J. Valle
我们在最简单的三中微子图像中给出了一个新的中微子振荡参数的全局拟合，包括自我们先前分析以来出现的新数据[1]。在这次更新中，我们包括了涉及T2K反中微子通道的新的长基线中微子数据，以及中微子通道的新数据，来自NOνA的数据，以及新的反应堆数据，如大亚湾1230天的电子反中微子消失谱数据和来自Reno的1500个存活天数的提示谱数据，以及新的Double Chooz数据。我们还包括来自IceCube DeepCore和Antares中微子望远镜以及来自Super-Kamiokande的大气中微子数据。最后，我们还更新了我们的太阳振荡分析，包括了来自Super-Kamiokande实验第四阶段的2055天昼夜光谱。根据新的数据，我们发现在两种中微子质量排序中，上八分星中的大气角度是优先的，对于正常(反向)排序，在Δχ2=1.6时允许最大混合。我们还获得了CP相δ在[π，2π]范围内的值的强烈偏好，排除了在大于4π时接近σ/2的值。更值得注意的是，我们的全局分析显示，在大于3σ的情况下，支持正常质量有序化的线索超过了倒置质量有序化。我们详细讨论了中微子质量有序化、CP破坏和八分灵敏度的状况，分析了不同中微子数据样本之间的相互作用。
We present a new global fit of neutrino oscillation parameters within the simplest three-neutrino picture, including new data which appeared since our previous analysis [1]. In this update we include new long-baseline neutrino data involving the antineutrino channel in T2K, as well as new data in the neutrino channel, data from NOνA, as well as new reactor data, such as the Daya Bay 1230 days electron antineutrino disappearance spectrum data and the 1500 live days prompt spectrum from RENO, as well as new Double Chooz data. We also include atmospheric neutrino data from the IceCube DeepCore and ANTARES neutrino telescopes and from Super-Kamiokande. Finally, we also update our solar oscillation analysis by including the 2055-day day/night spectrum from the fourth phase of the Super-Kamiokande experiment. With the new data we find a preference for the atmospheric angle in the upper octant for both neutrino mass orderings, with maximal mixing allowed at Δ χ 2= 1.6 (3.2) for normal (inverted) ordering. We also obtain a strong preference for values of the CP phase δ in the range [π, 2 π], excluding values close to π/2 at more than 4σ. More remarkably, our global analysis shows a hint in favor of the normal mass ordering over the inverted one at more than 3σ. We discuss in detail the status of the mass ordering, CP violation and octant sensitivities, analyzing the interplay among the different neutrino data samples.