Precision measurements and tau neutrino physics in a future accelerator neutrino experiment

Abstract

We investigate prospects of building a future accelerator-based neutrino oscillation experiment in China, including site selection, beam optimization and tau neutrino physics aspects. CP violation, non-unitary mixing and non-standard neutrino interactions are discussed. We simulate neutrino beam setups based on muon and beta decay techniques and compare Chinese laboratory sites by their expected sensitivities. A case study on Super Proton-Proton Collider and China JinPing Laboratory is also presented. It is shown that the muon-decay-based beam setup can measure the Dirac CP phase by about 14.2${}^{\circ }$ precision at 1$\sigma$ CL, whereas non-unitarity can be probed down to $|{\alpha }_{ij}|\lesssim$ 0.37 ($i\ne j=$ 1, 2, 3) and non-standard interactions to $|{ϵ}_{\ell {\ell }^{\prime }}^m|\lesssim$ 0.11 ($\ell \ne {\ell }^{\prime }=e$, $\mu$, $\tau$) at 90% CL, respectively.

Comments: 35 pages, 7 figures and 5 tables; matches the published version