Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam
Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam
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DOI：
10.1103/physrevlett.107.041801
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发表时间：
2011-07-18
影响因子：
8.6
通讯作者：
Zmuda, J.
中科院分区：
文献类型：
--
作者：
Abe, K.;Abgrall, N.;Zmuda, J.
T2 K实验观察到在靶上有1.43 × 10（20）个质子的情况下积累的数据中出现nu（mu）-> nu（mu）e的迹象。六个事件通过了远探测器的所有选择标准。在三味中微子振荡的情况下，|（23）第102章：一个女人的秘密|= 2.4 x 10（-3）eV（2），sin（2）2 θ（23）= 1，sin（2）2 θ（13）= 0，则此类事件的预期数量为1.5 +/- 0.3（syst）。在此假设下，观察到6个或更多候选事件的概率为7 x 10（-3），相当于2.5 sigma显著性。在90% C.L.，对于δ（CP）= 0和正常（倒置）层次，数据符合0.03（0.04）< sin（2）2 θ（13）< 0.28（0.34）。
The T2K experiment observes indications of nu(mu) -> nu(mu) e appearance in data accumulated with 1.43 x 10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Delta m(23)(2)| = 2.4 x 10(-3) eV(2), sin(2)2 theta(23) = 1 and sin(2)2 theta(13) = 0, the expected number of such events is 1.5 +/- 0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7 x 10(-3), equivalent to 2.5 sigma significance. At 90% C.L., the data are consistent with 0.03(0.04) < sin(2)2 theta(13) < 0.28(0.34) for delta(CP) = 0 and a normal (inverted) hierarchy.