Measurement of Atmospheric Neutrino Oscillations with IceCube
Measurement of Atmospheric Neutrino Oscillations with IceCube
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DOI：
10.1103/physrevlett.111.081801
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发表时间：
2013-08-19
影响因子：
8.6
通讯作者：
Zoll, M.
中科院分区：
文献类型：
--
作者：
Aartsen, M. G.;Abbasi, R.;Zoll, M.
我们通过对 2010 年和 2011 年收集的 IceCube 中微子观测站数据的分析，首次对高能区域（> 20 GeV）中微子振荡进行了统计上的显着检测。这种测量是通过 DeepCore 探测器的低能量阈值（类似于 20 GeV）实现的，并且受益于使用 IceCube 探测器作为宇宙射线诱发 μ 子背景的否决权。在从 DeepCore 收集的数据中提取的低能 μ 子中微子样本 (20-100 GeV) 中检测到振荡信号。从 IceCube 数据中提取高能 μ 子中微子样本（100 GeV-10 TeV）以限制系统不确定性。观察到低能上行μ子中微子的消失，并且以超过5西格玛的显着性拒绝了非振荡假说。在双中微子风味形式中，我们的数据最好用大气中微子振荡参数垂直条 Delta m(32)(2)垂直条 = (2.3(-0.5)(+0.6)) x 10(-3) eV(2) 和 sin(2) (2 theta(23)) > 0.93 来描述，并且倾向于最大混合。
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 and 2011. This measurement is made possible by the low-energy threshold of the DeepCore detector (similar to 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. The disappearance of low-energy upward-going muon neutrinos was observed, and the nonoscillation 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 vertical bar Delta m(32)(2)vertical bar = (2.3(-0.5)(+0.6)) x 10(-3) eV(2) and sin(2) (2 theta(23)) > 0.93, and maximum mixing is favored.