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Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam

K. Abe et al. (T2K Collaboration)
Phys. Rev. Lett. 107, 041801 – Published 18 July 2011
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Abstract

The T2K experiment observes indications of νμνe appearance in data accumulated with 1.43×1020 protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm232|=2.4×103eV2, sin22θ23=1 and sin22θ13=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 7×103, equivalent to 2.5σ significance. At 90% C.L., the data are consistent with 0.03(0.04)<sin22θ13<0.28(0.34) for δCP=0 and a normal (inverted) hierarchy.

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  • Received 13 June 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.041801

© 2011 American Physical Society

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A new neutrino oscillation

Published 18 July 2011

The T2K collaboration in Japan sees strong hints of muon neutrino to electron neutrino oscillation.

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Vol. 107, Iss. 4 — 22 July 2011

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