Global oscillation data analysis on the 3ν mixing without unitarity

We present results of a combined analysis in neutrino oscillations without unitarity assumption in the 3 nu mixing picture. Constraints on neutrino mixing matrix elements are based on recent data from the reactor, solar and long-baseline accelerator neutrino oscillation experiments. The current data are consistent with the standard 3 nu scheme. The precision on different matrix elements can be as good as a few percent at 3 sigma CL, and is mainly limited by the experimental statistical uncertainty. The nu (e) related elements are the most precisely measured among all sectors with the uncertainties < 20%. The measured leptonic CP violation is very close to the one assuming the standard 3 mixing. The deviations on normalization and the unitarity triangle closure are confined within O(10(-3)), O(10(-2)) and O(10(-1)), for nu (e), nu (mu) and nu (tau) sectors, respectively. We look forward to the next-generation neutrino oscillation experiments such as DUNE, T2HK, and JUNO, especially the precision measurements on nu (tau) oscillations, to significantly improve the precision of unitarity test on the 3 nu mixing matrix.

Automated summary

The study of neutrino oscillations without unitarity assumption shows consistency with the standard three-neutrino scheme and can achieve precision to a few percent. The elements related to neutrino (ν(e)) are the most precisely measured, and the measured leptonic CP violation is close to the standard three mixing. The precision of unitarity test is expected to be significantly improved with next-generation neutrino oscillation experiments.