Speaker
Description
The T2K (Tokai to Kamioka) experiment is a long-baseline neutrino oscillation experiment that studies accelerator-produced muon neutrinos and antineutrinos oscillations over a 295 km baseline from J-PARC to the Super-Kamiokande detector in Japan. Its primary goals are the precise measurement of the PMNS mixing angles $\theta_{23}$ and $\theta_{13}$, the mass-squared splitting $\Delta m^2_{32}$, and the search for CP violation through the $\delta_\mathrm{CP}$ phase.
This talk presents the latest oscillation results from T2K, based on a beam exposure of $2.14\times10^{21}$ protons on target (POT) in neutrino mode and $1.63\times10^{21}$ POT in antineutrino mode. This analysis incorporates noticeably a new modeling of the low energy transfer interactions, an overhauled Near Detector selection with $4\pi$ coverage, and a new Far Detector $\nu_e$CC$1\pi$ sample with merged one-ring and multi-ring topologies. These changes overall improve the robustness of our $\Delta m^2$ measurement, and reduce our systematic uncertainty accounting for potential mismodeling biases. In addition, our statistical treatment of CP violation test has been improved, making it both more powerful and more robust.