TY  - JOUR
AU  - T2K Collaboration (Abe, K. et al
AU  - Cervera-Villanueva, A.
AU  - Escudero, L.
AU  - Gomez-Cadenas, J. J.
AU  - Hansen, C.
AU  - Monfregola, L.
AU  - Sorel, M.
AU  - Stamoulis, P.
PY  - 2011
DA  - 2011//
TI  - Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 041801
EP  - 8pp
VL  - 107
IS  - 4
PB  - Amer Physical Soc
AB  - The T2K experiment observes indications of nu(mu) -> nu(mu) e appearance in data accumulated with 1.43 x 10(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 x 10(-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 +/- 0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7 x 10(-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(CP) = 0 and a normal (inverted) hierarchy.
SN  - 0031-9007
UR  - http://arxiv.org/abs/arXiv:1106.2822
UR  - https://doi.org/10.1103/PhysRevLett.107.041801
DO  - 10.1103/PhysRevLett.107.041801
LA  - English
N1  - WOS:000292822700003
ID  - T2KCollaborationAbe_etal2011
ER  -