Results and Prospects from T2K

TL;DR

This paper reports recent T2K antineutrino oscillation measurements, including the first electron antineutrino appearance analysis and precise muon antineutrino disappearance parameters, contributing to understanding CP violation and matter effects.

Contribution

It presents the first electron antineutrino appearance results at T2K and provides world-leading measurements of muon antineutrino oscillation parameters, consistent with previous findings.

Findings

Measured $ heta_{23}$ and $ar{ heta}_{23}$ consistent with prior results.

First analysis of electron antineutrino appearance at T2K.

Provides precise measurements of $ar{ u}_ ext{oscillation}$ parameters.

Abstract

As measurements of the neutrino oscillation parameters improve it is becoming more interesting to study antineutrino oscillations, to investigate CP and CPT violation in the lepton sector and nonstandard matter effects. We present the most recent T2K antineutrino oscillation results, from data collected using a muon antineutrino-enhanced neutrino beam corresponding to 4.01E20 protons on target. The first analysis of electron antineutrino appearance at T2K is presented, as well as world-leading measurements of the dominant oscillation parameters for muon antineutrino disappearance. T2K measures $\sin^2(\bar{\theta}_{23}) = 0.46^{+0.14}_{-0.06}$ and $\Delta \bar{m}^2_{32} = 2.50^{+0.3}_{-0.2} \times 10^{-3} \mbox{eV}^2$, which is consistent with previous T2K measurements of the neutrino oscillation parameters and existing antineutrino measurements.