First Antineutrino Oscillation Results from T2K

As limits improve on the neutrino mixing angles and mass-squared differences, the focus of T2K has shifted towards studying antineutrino oscillation. This will give an insight into CP violation (if P($\barν_μ \rightarrow \barν_{e}) \neq \mbox{P}(ν_μ \rightarrow ν_e)$) and CPT violation (if P($\barν_μ \rightarrow \barν_μ) \neq \mbox{P}(ν_μ \rightarrow ν_μ)$) in the lepton sector. This poster summarises the most recent T2K antineutrino oscillation results, from data collected using a $\barν_μ$-enhanced neutrino beam corresponding to $4.01 \times 10^{20}$ protons on target (roughly $1/3$ of the total protons on target collected by T2K). We present world-leading measurements of $Δ\bar{m}^2_{32}$ and $\sin^2\barθ_{23}$ and the first analysis of $\barν_e$ appearance from T2K. Both results use a Bayesian oscillation analysis based on a Markov Chain Monte Carlo method in which data from the near detector and far detector are fit simultaneously.

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