| 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$sigma$ when compared to 4.92 $pm$ 0.55 expected
background events. In the PMNS mixing model, the electron neutrino appearance
signal depends on several parameters including three mixing angles
$ heta_{12}$, $ heta_{23}$, $ heta_{13}$, a mass difference $Delta
m^2_{32}$ and a CP violating phase $delta_{mathrm{CP}}$. In this neutrino
oscillation scenario, assuming $|Delta m^2_{32}| = 2.4 imes 10^{-3}$ $
m
eV^2$, $sin^2 heta_{23} = 0.5$, $delta_{mathrm{CP}}=0$, and $Delta
m^2_{32} >0$ ($Delta m^2_{32} <0$), a best-fit value of $sin^2 2 heta_{13}$
= $0.140^{+0.038}_{-0.032}$ ($0.170^{+0.045}_{-0.037}$) is obtained. |
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