Observation of Electron Neutrino Appearance in a Muon Neutrino Beam
arXiv:1311.4750 · doi:10.1103/PhysRevLett.112.061802
Abstract
The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3 when compared to 4.92 0.55 expected background events. In the PMNS mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles , , , a mass difference and a CP violating phase . In this neutrino oscillation scenario, assuming , , and (), a best-fit value of = () is obtained at . When combining the result with the current best knowledge of oscillation parameters including the world average value of from reactor experiments, some values of are disfavored at the 90% CL.
arXiv comment8 pages, 6 figures
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