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

Collaboration

Jun, 2011

20 pages

Published in:

e-Print:

DOI:

PDG: sin

^2(\theta _{13})

Experiments:

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Abstract:

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 normal (inverted) hierarchy.

References(0)

Figures(7)

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