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Título

Evidence of electron neutrino appearance in a muon neutrino beam

AutorT2K Collaboration; Abe, Kou; Cervera Villanueva, Anselmo ; Escudero Sánchez, Lorena ; Gómez Cadenas, Juan José ; Izmaylov, A. ; Monfregola, Laura ; Sorel, Michel ; Stamoulis, Panagiotis
Palabras claveAbsorption cross-sections
Momentum range
Fecha de publicación5-ago-2013
EditorAmerican Physical Society
CitaciónPhysical Review - Section D - Particles and Fields 88 (3): 032002 - 41 (2013)
ResumenThe 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).
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.88.032002
URIhttp://hdl.handle.net/10261/126330
DOI10.1103/PhysRevD.88.032002
ISSN1550-7998
E-ISSN1550-2368
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