Results and Prospects from T2K

As measurements of the neutrino oscillation parameters improve it is becoming more interesting to study antineutrino oscillations, to investigate CP and CPT violation in the lepton sector and nonstandard matter effects. We present the most recent T2K antineutrino oscillation results, from data collected using a muon antineutrino-enhanced neutrino beam corresponding to 4.01E20 protons on target. The first analysis of electron antineutrino appearance at T2K is presented, as well as world-leading measurements of the dominant oscillation parameters for muon antineutrino disappearance. T2K measures $\sin^2(\barθ_{23}) = 0.46^{+0.14}_{-0.06}$ and $Δ\bar{m}^2_{32} = 2.50^{+0.3}_{-0.2} \times 10^{-3} \mbox{eV}^2$, which is consistent with previous T2K measurements of the neutrino oscillation parameters and existing antineutrino measurements.

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