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

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	T2K Collaboration; Abe, K.; Cervera Villanueva, Anselmo; Escudero Sánchez, Lorena; Gómez Cadenas, Juan José Perfil; Hansen, C.; Monfregola, Laura; Sorel, Michel; Stamoulis, Panagiotis
	This document is a artículoDate2011
	Este documento está disponible también en : http://hdl.handle.net/10550/49652
	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.
	T2K Collaboration Abe, K. Cervera Villanueva, Anselmo Escudero Sánchez, Lorena Gómez Cadenas, Juan José Hansen, C. Monfregola, Laura Sorel, Michel Stamoulis, Panagiotis 2011 Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam Physical Review Letters 107 4 041801
	http://dx.doi.org/10.1103/PhysRevLett.107.041801