Latest results from T2K and T2K Phase II

TL;DR

T2K's latest results include the first constraints on the CP-violating phase and the most precise measurement of the θ23 mixing angle, advancing understanding of neutrino oscillations.

Contribution

This paper reports new constraints on δCP and an improved measurement of θ23 from T2K Phase II, enhancing the precision of neutrino oscillation parameters.

Findings

First constraints on δCP excluding CP conservation at 2σ

Best measurement of θ23 mixing angle

Advancement in neutrino oscillation parameter precision

Abstract

T2K is a long-baseline neutrino oscillation experiment using a $\nu_{\mu}$ beam produced at the J-PARC facility. Neutrinos are detected at a Near Detector complex (ND280) and at the Far Detector (Super-Kamiokande). The most recent oscillation results presented by T2K are described in these proceedings. With these data T2K has produced the first constraints on $\delta_{CP}$, excluding CP conserving values at 2$\sigma$ and the world best measurement of the $\theta_{23}$ mixing angle.