Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos
Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos
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DOI：
10.1007/jhep08(2018)010
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发表时间：
2018-03
影响因子：
5.4
通讯作者：
Mona Dentler;Álvaro Hernández-Cabezudo;J. Kopp;P. Machado;M. Maltoni;I. Martinez-Soler;T. Schwetz
中科院分区：
文献类型：
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作者：
Mona Dentler;Álvaro Hernández-Cabezudo;J. Kopp;P. Machado;M. Maltoni;I. Martinez-Soler;T. Schwetz
我们讨论了用稀薄中微子解释短基线中微子振荡实验中反常现象的可能性。我们在3+1框架下工作，并特别关注来自反应堆实验、IceCube和MINOS+的最新数据。我们发现，DANSS和NEOS反应堆实验的结果支持对反应堆异常的稀有中微子的解释，这是基于完全依赖于测量的反应堆光谱的相对比较的分析。来自νe消失通道的全球数据支持3σ水平的无菌中微子振荡，Δm 2 41≈1.3 eV2和|U e4|≈0。1，即使对预测的反应堆通量没有任何假设。相比之下，νe出现通道的异常(以LSND为主)处于强烈的紧张状态，νμ消失的边界得到改善，主要是由MINOS+和冰立方驱动的。在稀薄中微子振荡假设下，这些数据集的一致p值小于2.6×10−6。因此，在4.7σ水平上排除了用3+1情景中稀薄中微子振荡来解释LSND异常的可能性。这一结果对于分析和使用的数据的变化是稳健的，特别是它既不依赖于理论预测的反应堆中微子通量，也不依赖于任何单一实验的约束。不考虑反常，我们提供了对EV范围内具有第四中微子质量状态的活动中微子的允许混合强度|Uα4|(α=e，μ，τ)的最新约束。
We discuss the possibility to explain the anomalies in short-baseline neutrino oscillation experiments in terms of sterile neutrinos. We work in a 3+ 1 framework and pay special attention to recent new data from reactor experiments, IceCube and MINOS+. We find that results from the DANSS and NEOS reactor experiments support the sterile neutrino explanation of the reactor anomaly, based on an analysis that relies solely on the relative comparison of measured reactor spectra. Global data from the ν e disappearance channel favour sterile neutrino oscillations at the 3σ level with Δm 2 41≈ 1.3 eV 2 and| U e4|≈ 0. 1, even without any assumptions on predicted reactor fluxes. In contrast, the anomalies in the ν e appearance channel (dominated by LSND) are in strong tension with improved bounds on ν μ disappearance, mostly driven by MINOS+ and IceCube. Under the sterile neutrino oscillation hypothesis, the p-value for those data sets being consistent is less than 2. 6× 10− 6. Therefore, an explanation of the LSND anomaly in terms of sterile neutrino oscillations in the 3+ 1 scenario is excluded at the 4. 7σ level. This result is robust with respect to variations in the analysis and used data, in particular it depends neither on the theoretically predicted reactor neutrino fluxes, nor on constraints from any single experiment. Irrespective of the anomalies, we provide updated constraints on the allowed mixing strengths| U α4|(α= e, μ, τ) of active neutrinos with a fourth neutrino mass state in the eV range.