Confronting tridirect CP-symmetry models with neutrino oscillation experiments.

Tridirect CP symmetry is an economical neutrino model building paradigm, and it allows for the description of neutrino masses, mixing angles, and CP violation phases in terms of four free parameters. The viability of a class of tridirect CP models is examined with a comprehensive simulation of current and future neutrino oscillation experiments. The full parameter space of four independent parameters is carefully scanned, and the problem of parameter degeneracy appears for the constraints from one group of neutrino oscillation experiments. Two benchmark models which are promising from a model building point of view are also examined. Complementary roles from accelerator neutrino experiments (e.g., T2HK and DUNE) and reactor neutrino experiments (e.g., JUNO) are crucial to break the degeneracy and nail down the fundamental neutrino mixing parameters of the underlying theory. [ABSTRACT FROM AUTHOR]