# Proposal for an Extended Run of T2K to $20\times10^{21}$ POT

Abe, K, Aihara, H, Amji, A, Amey, J, Andreopoulos, C ORCID: 0000-0003-2020-8215, Antonova, M, Aoki, S, Atherton, A, Ban, S, Barbato, FCT
et al (show 307 more authors) Proposal for an Extended Run of T2K to $20\times10^{21}$ POT. [Internet Publication]

Recent measurements by the T2K neutrino oscillation experiment indicate that CP violation in neutrino mixing may be observed in the future by long-baseline neutrino oscillation experiments. We propose an extension to the currently approved T2K running from $7.8\times 10^{21}~\mbox{POT}$ to $20\times 10^{21}~\mbox{POT}$, aiming at initial observation of CP violation with 3$\,\sigma$ or higher significance for the case of maximum CP violation. The program also contains a measurement of mixing parameters, $\theta_{23}$ and $\Delta m^2_{32}$, with a precision of 1.7$^\circ$ or better and 1%, respectively. With accelerator and beamline upgrades, as well as analysis improvements, this program would occur before the next generation of long-baseline neutrino oscillation experiments that are expected to start operation in 2026.