T2K & beyond

TL;DR

This paper reviews the current status and future prospects of the T2K neutrino experiment, highlighting recent results, sensitivity re-evaluations, and potential for significant discoveries in neutrino oscillation parameters before next-generation experiments commence.

Contribution

It provides an updated assessment of T2K's physics potential with increased data exposure and discusses the implications of recent measurements on future neutrino research.

Findings

Observation of electron neutrino appearance in muon neutrino beam

High-precision measurements of mixing angle theta13

Potential to measure CP violation at 3 sigma level

Abstract

This article presents the status of the art of the T2K experiment and the measurements prospects for the incoming years. After a brief description of the experiment, the most recent results will be illustrated. The observation of the electron neutrino appearance in a muon neutrino beam and the new high-precision measurements of the mixing angle theta13 by the reactor experiments have led to a re-evaluation of the expected sensitivity to the oscillation parameters, relative to what was given in the original T2K proposal. For this reason the new physics potential of T2K for 7.8 x 10**21 p.o.t. and for a data exposure 3 times larger than it's expected to be reachable with accelerator and beam line upgrades in 2026 before the start of operation of the next generation of long-baseline neutrino oscillation experiments will also be described in the text. In particular the last challenging scenario opens the door to the possibility to obtain, under some conditions, a 3 sigma measurement excluding sin(deltaCP= 0.