MINOS 中μ子中微子到电子中微子振荡的改进搜索。
Improved search for Muon-neutrino to electron-neutrino oscillations in MINOS.
机构信息
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
出版信息
Phys Rev Lett. 2011 Oct 28;107(18):181802. doi: 10.1103/PhysRevLett.107.181802. Epub 2011 Oct 27.
We report the results of a search for ν(e) appearance in a ν(μ) beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of 8.2 × 10(20) protons on the NuMI target at Fermilab, we find that 2 sin(2) (θ(23))sin(2)(2θ(13))<0.12(0.20) at 90% confidence level for δ = 0 and the normal (inverted) neutrino mass hierarchy, with a best-fit of 2sin(2) (θ(23))sin(2)(2θ(13)) = 0.041(-0.031)(+0.047) (0.079(-0.053) (+0.071)). The θ(13) = 0 hypothesis is disfavored by the MINOS data at the 89% confidence level.
我们报告了在 MINOS 长基线中微子实验中 ν(μ)束中寻找 ν(e)出现的结果。通过改进分析和增加对费米实验室 NuMI 靶标 8.2×10(20)个质子的曝光度，我们发现对于 δ = 0 和正常（倒转）中微子质量顺序，在 90%置信水平下，2sin(2)(θ(23))sin(2)(2θ(13))<0.12(0.20)，最佳拟合值为 2sin(2)(θ(23))sin(2)(2θ(13)) = 0.041(-0.031)(+0.047)(0.079(-0.053)(+0.071))。θ(13) = 0 的假设在 MINOS 数据中被排除在 89%置信水平之外。
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