University of Tokyo, Institute for Cosmic Ray Research, Kamioka Observatory, Kamioka, Japan.
Phys Rev Lett. 2011 Jul 22;107(4):041801. doi: 10.1103/PhysRevLett.107.041801. Epub 2011 Jul 18.
The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm(23)(2)| = 2.4×10(-3) eV(2), sin(2)2θ(23) = 1 and sin(2)2θ(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 7×10(-3), equivalent to 2.5σ significance. At 90% C.L., the data are consistent with 0.03(0.04) < sin(2)2θ(13) < 0.28(0.34) for δ(CP) = 0 and a normal (inverted) hierarchy.
T2K 实验在 1.43×10(20)个质子靶上积累的数据中观察到 ν(μ)→ν(e) 出现的迹象。远探测器中有 6 个事件通过了所有选择标准。在三轻子中微子振荡模型中，|Δm(23)(2)|=2.4×10(-3)eV(2)，sin(2)2θ(23)=1 和 sin(2)2θ(13)=0，预期此类事件的数量为 1.5±0.3(syst)。在这个假设下，观察到 6 个或更多候选事件的概率为 7×10(-3)，相当于 2.5σ 显著性。在 90%置信水平下，对于 δ(CP)=0 和正常(反演)顺序，数据与 0.03(0.04)<sin(2)2θ(13)<0.28(0.34)一致。
