The latest T2K neutrino oscillation results

TL;DR

The T2K experiment's latest results from 2010-2017 data provide precise measurements of neutrino oscillation parameters and suggest CP violation in the neutrino sector at 90% confidence level.

Contribution

This paper presents the most recent combined analysis of T2K data, measuring key neutrino oscillation parameters and providing evidence for CP violation.

Findings

Measured four neutrino oscillation parameters.

Excluded CP conservation at 90% confidence level.

Analyzed data from 2010 to 2017 with over 7.2×10^{20} POT in neutrino and antineutrino modes.

Abstract

T2K is a long-baseline neutrino oscillation experiment taking data since 2010. A neutrino beam is produced at the J-PARC accelerator in Japan and is sampled at a Near Detector complex 280 m from the neutrino production point and at the far detector, Super-Kamiokande, located 295 km from the source. Beams predominantly composed of muon neutrinos or muon anti-neutrinos have been produced by changing the currents in the magnetic focusing horns. This presentation will show the most recent T2K oscillation results obtained from a combined analysis of the entire available data set in the muon neutrino and muon anti-neutrino disappearance channels, and in the electron neutrino and electron anti-neutrino appearance channels. The data cover runs 1 to 8 (2010 to 2017) and consist of $7.252 \cdot 10^{20}$ POT in neutrino mode and $7.531 \cdot 10^{20}$ POT in antineutrino mode. Using these data, we measure four oscillations parameters: $\sin^2 \theta_{23}$, $\sin^2 \theta_{13}$, $\Delta m_{32}^2$ and $\delta_{CP}$. The analysis excludes CP-conservation in the neutrino sector at 90\% C.L.