Collaboration, T;
Abe, K;
Abgrall, N;
Ajima, Y;
Aihara, H;
Albert, JB;
Andreopoulos, C;
... Zmuda, J; + view all
(2011)
Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam.
Physical Review Letters
, 107
(4)
, Article 041801. 10.1103/PhysRevLett.107.041801.
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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 a normal (inverted) hierarchy.
| Type: | Article |
|---|---|
| Title: | Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.107.041801 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.107.041801 |
| Language: | English |
| Additional information: | © 2011 American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1348007 |
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