The WAGASCI detector as an off-axis near detector of the T2K and Hyper-Kamiokande experiments

摘要

In the search for CP violation at the T2K and future Hyper-Kamiokandeexperiments, it is crucial to reduce the present systematic uncertainties. Thecurrent T2K near detector, ND280, reduces the uncertainties coming from theneutrino beam and cross-section models from $11.9\%$ to $5.4\%$ in the$\nu_{e}$ appearance channel. These residual uncertainties mostly come fromintrinsic limitations of ND280 due to its difference in target material andangular acceptance with the far detector.\\ In order to show evidence(subsequently observation) of the CP violation in the T2K phase-II andHyper-Kamiokande experiments, this paper proposes an upgrade of the ND280detector. It uses a 3D grid scintillator structure surrounded by TimeProjecting Chambers in order to reconstruct particles with $\sim 4\pi$acceptance.