Recent results from T2K

Abstract

The T2K long-baseline neutrino oscillation experiment has produced the first observation of ${\nu }_e$ appearance and the most precise measurement of the mixing angle ${\theta }_{23}$ from $6.57\times 10^{20}$ protons-on-target (POT) of neutrino beam data. We present here the results of T2K antineutrino oscillation analyses searching for ${\bar{\nu }}_e$ appearance and measuring the dominant oscillation parameters for ${\bar{\nu }}_{\mu }$ disappearance, including the results from the T2K near detector fit. Using $4.01\times 10^{20}$ POT of antineutrino beam data T2K measured ${\sin }^2({\bar{\theta }}_{23})=0.45_{-0.12}^{+0.29}$ and $|\Delta {\bar{m}}_{32}^2|=2.51\pm 0.28\times 10^{-3}(e{V}^2)$, consistent with previous existing ${\nu }_{\mu }$ and ${\bar{\nu }}_{\mu }$ disappearance measurements. From the same dataset 3 ${\bar{\nu }}_e$ candidate events were selected at the far detector, which did not provide evidence either for or against the ${\bar{\nu }}_e$ appearance hypothesis.

9 pages, 7 figures, contribution to the proceedings of Les Rencontres de Physique de la Vallee d'Aoste, La Thuile, Aosta Valley, Italy, March 6-12, 2016