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arXiv 1109.4033hep-phastro-ph.COhep-ex
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3+1中微子混合

Status of 3+1 Neutrino Mixing

Carlo Giunti, Marco Laveder

备注：
10 pages. Changed title. Final version to be published in PRD
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摘要：

考虑到MiniBooNE反中微子数据的最新更新和MINOS对nu_mu消失为无菌中微子的最新结果（由于MiniBooNE中微子和反中微子数据之间的CP破坏差异已经减小，因此不需要更复杂的3+2中微子混合），我们在3+1中微子混合的框架内对短基线中微子振荡数据的分析进行了更新。我们的短基线中微子振荡数据，包括MiniBooNE低能量异常（目前在中微子和反中微子数据）的拟合的结果导致出现和消失的数据之间的强烈张力。因此，低能异常似乎不是由于nu_mu -> nu_e跃迁。排除MiniBooNE低能异常，出现和消失的数据是勉强兼容的。整体分析的最佳拟合点在Δ m^2_{41}处，约为5.6 eV^2，这与宇宙学边界相比相当大，但在Δ m^2_{41}处，在1 σ范围内有三个区域，约为1.6、1.2和0.91 eV^2。我们还表明，镓中微子异常的数据有利于Δ m^2_{41}值大于约1 eV^2。

英文摘要：

We present an update of our analysis of short-baseline neutrino oscillation data in the framework of 3+1 neutrino mixing taking into account the recent update of MiniBooNE antineutrino data and the recent results of the MINOS search for nu_mu disappearance into sterile neutrinos (the more complicated 3+2 neutrino mixing is not needed since the CP-violating difference between MiniBooNE neutrino and antineutrino data has diminished). The results of our fits of short-baseline neutrino oscillation data including the MiniBooNE low-energy anomaly (now present both in the neutrino and antineutrino data) leads to a strong tension between appearance and disappearance data. Hence, it seems likely that the low-energy anomaly is not due to nu_mu -> nu_e transitions. Excluding the MiniBooNE low-energy anomaly, appearance and disappearance data are marginally compatible. The global analysis has the best-fit point at Delta m^2_{41} about 5.6 eV^2, which is rather large in comparison with cosmological bounds, but there are three regions within 1 sigma at Delta m^2_{41} about 1.6, 1.2, 0.91 eV^2. We also show that the data on the Gallium neutrino anomaly favor values of Delta m^2_{41} larger than about 1 eV^2.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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