Measurements of neutrino oscillation parameters from the T2K experiment using $3.6\times10^{21}$ protons on target

Understand

The T2K experiment presents new measurements of neutrino oscillation parameters using $19.7(16.3)\times10^{20}$ protons on target (POT) in (anti-)neutrino mode at the far detector (FD).

• Compared to the previous analysis, an additional $4.7\times10^{20}$ POT neutrino data was collected at the FD.
• Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data.
• Additionally, this is the first T2K oscillation analysis to use NA61/SHINE data on a replica of the T2K target to tune the neutrino flux model, and the neutrino interaction model was improved to include new nuclear effects and calculations.