T2K Results and Future Plans

TL;DR

The T2K experiment reports on neutrino oscillation results, measuring muon neutrino disappearance and electron neutrino appearance, with implications for neutrino mixing parameters, and outlines future research plans.

Contribution

This paper provides new measurements of neutrino oscillation parameters using T2K data and discusses future experimental plans.

Findings

Muon neutrino disappearance excludes no oscillations at 4.3 sigma.

Constraints on sin^2 2theta_{13} for different hierarchies.

Best fit values for sin^2 2theta_{23} and Delta m^2_{23}.

Abstract

We present the numu to nue appearance and the numu disappearance results, using a total of 1.43 x 10^{20} protons on target collected with the T2K experiment. T2K is long baseline neutrino experiment in Japan with detectors located at J-PARC, Tokai, and at Kamioka in the Gifu Prefecture, situated 295 km away from J-PARC. The muon neutrino beam is produced and measured at the near detectors at J-PARC whilst the neutrino rates after oscillation are measured with the Super-Kamiokande detector, at Kamioka. A total of six events pass all the selection criteria for numu to nue oscillations at the far detector Super-Kamiokande, leading to 0.03(0.04) < sin^2 2theta_{13} < 0.28(0.34) for deltaCP = 0 and normal (inverted) hierarchy at 90% C.L. The numu disappearance analysis excludes no oscillations at 4.3 sigma. At 90% C.L., the best fit values are sin^2 2theta_{23} > 0.84 and 2.1 x 10^{-3} < Delta m^2_{23} (eV^2) < 3.1 x 10^{-3}. Finally, we present an overview of the T2K plans from 2011 onwards.