The T2K Near Detector Upgrade

Abstract

The T2K experiment is a long-baseline neutrino oscillation experiment that aims to precisely measure neutrino oscillation parameters. The muon (anti)neutrino beam produced at J-PARC is measured at the near detector complex and at the far detector Super-Kamiokande. The major role of the near detector ND280 is to constrain systematic uncertainties that affect neutrino oscillation measurements. T2K is currently upgrading ND280 to fully leverage the expected increase of statistics over the upcoming years and to further improve the constraints on those uncertainties, particularly the ones related to the neutrino interaction model. The capabilities of full polar angle acceptance, lower proton tracking threshold as well as reconstruction of neutron kinematics that this upgrade offers will open the door to explore new physics with unprecedented precision.