TY  - JOUR
AU  - T2K Collaboration (Abe, K. et al
AU  - Cervera-Villanueva, A.
AU  - Escudero, L.
AU  - Gomez-Cadenas, J. J.
AU  - Izmaylov, A.
AU  - Monfregola, L.
AU  - Sorel, M.
AU  - Stamoulis, P.
PY  - 2013
DA  - 2013//
TI  - Evidence of electron neutrino appearance in a muon neutrino beam
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 032002
EP  - 41pp
VL  - 88
IS  - 3
PB  - Amer Physical Soc
AB  - The T2K Collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, vertical bar Delta m(32)(2)vertical bar approximate to 2.4 X 10(-3) eV(2). An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3 +/- 0.4(syst) events is expected. The background-only hypothesis is rejected with a p value of 0.0009 (3.1 sigma), and a fit assuming nu(mu) -> nu(e) oscillations with sin (2)2 theta(23) = 1, delta(CP) = 0 and vertical bar Delta m(32)(2)vertical bar = 2.4 X 10(-3) eV(2) yields sin (2)2 theta(13) = 0.088(-0.039)(+0.049)(stat + syst).
SN  - 1550-7998
UR  - http://arxiv.org/abs/arXiv:1304.0841
UR  - https://doi.org/10.1103/PhysRevD.88.032002
DO  - 10.1103/PhysRevD.88.032002
LA  - English
N1  - WOS:000322797500004
ID  - T2KCollaborationAbe_etal2013
ER  -