Results from T2K

TL;DR

The T2K experiment studies neutrino oscillations using a muon neutrino beam from J-PARC to Super-Kamiokande, measuring oscillation parameters and neutrino cross sections, providing key insights into neutrino properties and interactions.

Contribution

This paper presents the latest measurements of neutrino oscillation parameters and cross sections from the T2K experiment, advancing understanding of neutrino physics.

Findings

Precise measurements of $ heta_{13}$, $ heta_{23}$, and $ ext{Δ}m^2_{ ext{atm}}$.

World-leading neutrino cross-section data in the sub-GeV range.

Constraints on the CP-violating phase $ ext{δ}_{CP}$.

Abstract

The Tokai to Kamioka (T2K) experiment uses a beam of muon neutrinos, produced at the J-PARC facility on the east coast of Japan, to study neutrino oscillations driven by the $\Delta m_{\textrm{atm}}^{2}$ mass splitting. A suite of near detectors located 280~m from the secondary beam source samples the unoscillated beam, and the Super-Kamiokande water Cherenkov detector samples the beam at a baseline of 295~km, and at a point $2.5^\circ$ off the beam axis, giving a narrow-band beam centred around 600~MeV. Analyses of the oscillation channels $\nu_\mu \to \nu_e$ and $\nu_\mu \to \nu_\mu$ allow measurements to be made of $\theta_{13}$, $\theta_{23}$ and $\Delta m^2_{\textrm{atm}}$, and, ultimately, for weak constraints to be placed on the CP-violating phase $\delta_{CP}$. In addition to these analyses, T2K has made world-leading neutrino cross-section measurements in the sub-GeV energy range, utilising both the near and far detectors. The present work will discuss both the most recent measurements of the oscillation parameters, and these cross section analyses.