标题： 冰立方中微子振荡的测量 显示英文标题

标题： Measurement of Atmospheric Neutrino Oscillations with IceCube

摘要： 我们首次在高能区域（$>$20 GeV）通过分析IceCube中微子天文台在2010-2011年收集的数据，实现了中微子振荡的统计显著检测。 这一测量得益于DeepCore探测器的低能量阈值（$\sim 20$GeV），并受益于使用IceCube探测器作为对抗宇宙射线引起的μ子背景的筛选器。 在从DeepCore采集的数据中提取的低能μ子中微子样本（20 – 100 GeV）中检测到了振荡信号。 从IceCube数据中提取了一个高能μ子中微子样本（100 GeV – 10 TeV）以限制系统不确定性。 观察到了低能向上运动μ子中微子的消失，并且非振荡假设被拒绝，显著性超过$5\sigma$。 在两个中微子味的形式中，我们的数据最好由大气中微子振荡参数$\Delta m^2_{23}= (2.3^{+0.6}_{-0.5})\cdot 10^{-3}$eV$^2$和$\sin^2(2 \theta_{23})>0.93$描述，并且最大混合被偏好。 显示英文摘要

摘要： We present the first statistically significant detection of neutrino oscillations in the high-energy regime ($>$ 20 GeV) from an analysis of IceCube Neutrino Observatory data collected in 2010-2011. This measurement is made possible by the low energy threshold of the DeepCore detector ($\sim 20$ GeV) and benefits from the use of the IceCube detector as a veto against cosmic ray-induced muon background. The oscillation signal was detected within a low-energy muon neutrino sample (20 -- 100 GeV) extracted from data collected by DeepCore. A high-energy muon neutrino sample (100 GeV -- 10 TeV) was extracted from IceCube data to constrain systematic uncertainties. Disappearance of low-energy upward-going muon neutrinos was observed, and the non-oscillation hypothesis is rejected with more than $5\sigma$ significance. In a two-neutrino flavor formalism, our data are best described by the atmospheric neutrino oscillation parameters $\Delta m^2_{23}= (2.3^{+0.6}_{-0.5})\cdot 10^{-3}$ eV$^2$ and $\sin^2(2 \theta_{23})>0.93$, and maximum mixing is favored.