Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam

Details 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

2011-06-14

arxiv.org/abs/1106.2822v2

Phys.Rev.Lett.107:041801,2011

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 6 figures, version published in PRL

Scientific paper

10.1103/PhysRevLett.107.041801

The T2K experiment observes indications of $\nu_\mu\rightarrow \nu_e$ appearance in data accumulated with $1.43\times10^{20}$ protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with $|\Delta m_{23}^2|=2.4\times10^{-3}$ eV$^2$, $\sin^2 2\theta_{23}=1$ and $\sin^2 2\theta_{13}=0$, the expected number of such events is 1.5$\pm$0.3(syst.). Under this hypothesis, the probability to observe six or more candidate events is 7$\times10^{-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 $\delta_{\rm CP}=0$ and a normal (inverted) hierarchy.

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