Long Baseline Neutrino Oscillation Results (T2K and NOvA)

Abstract

The well-established neutrino oscillation phenomenon, which confirms neutrinos have mass and the charged and neutral leptons are mixed, has been widely exploited to investigate the physics of this elusive particle. The complete description of neutrino oscillations, which are dictated by two mass-squared splittings, three mixing angles, and one Dirac CP-violation phase, however, has yet to be reached. The ongoing accelerator-based long-baseline neutrino experiments, T2K and NOvA, are critical in completing this picture. Using data and analyses accessible by summer 2023, T2K favors a leptonic CP violation at more than 90\% C.L. while NOvA shows no preference of this indication. Both experiments weakly opt for the \emph{normal} neutrino mass ordering and higher octant of the $\theta_{23}$ mixing angle.