Abstract
The T2K long-baseline neutrino oscillation experiment has observed the disappearance of νμ and the appearance of νe from its νμ beam. Since 2010, it has accumulated 6.57×1020 protons on target and observed 120νμ and 28νe event candidates. With this dataset, corresponding to only ∼8% of its goal POT, T2K has achieved world leading results: the best precision in θ23, the strongest evidence of νe appearance in a νμ beam and the first hint on δCP. Its first joint 3-flavour oscillation analysis, combining the νμ disappearance and νe appearance channels, is presented in this paper using a Frequentist approach. The results of this analysis, combined with the measurements from reactor experiments, indicate that δCP is consistent with −π/2. Furthermore, the data excluded values of δCP in the interval [0.146,0.825]π([−0.080,1.091]π) at the 90% CL for normal (inverted) mass hierarchy.
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