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Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.
Department of Physics, Loyola University Chicago, Chicago, Illinois 60660, USA.
Phys Rev Lett. 2020 Oct 2;125(14):141801. doi: 10.1103/PhysRevLett.125.141801.
The results of a 3+1 sterile neutrino search using eight years of data from the IceCube Neutrino Observatory are presented. A total of 305 735 muon neutrino events are analyzed in reconstructed energy-zenith space to test for signatures of a matter-enhanced oscillation that would occur given a sterile neutrino state with a mass-squared differences between 0.01 and 100 eV^{2}. The best-fit point is found to be at sin^{2}(2θ_{24})=0.10 and Δm_{41}^{2}=4.5 eV^{2}, which is consistent with the no sterile neutrino hypothesis with a p value of 8.0%.
本文展示了利用冰立方中微子天文台八年数据进行的3+1无中微子搜索结果。在重建的能量-天顶角空间中，共分析了305735个μ子中微子事件，以测试物质增强振荡的特征，这种振荡在质量平方差为0.01至100 eV²的无中微子态下会发生。最佳拟合点为sin²(2θ₂₄)=0.10和Δm₄₁²=4.5 eV²，这与无无中微子假设一致，p值为8.0%。
