# Confronting Tri-direct CP-symmetry models to neutrino oscillation experiments

## TL;DR

This paper evaluates the viability of tri-direct CP symmetry models for neutrino physics by analyzing current and future oscillation experiments, highlighting the importance of combined experimental data to resolve parameter degeneracies.

## Contribution

It provides a comprehensive simulation and analysis of how current and upcoming neutrino experiments can test and constrain tri-direct CP symmetry models.

## Key findings

- Parameter degeneracy observed in current experiments.
- Complementary roles of accelerator and reactor experiments to resolve degeneracies.
- Potential to determine fundamental neutrino mixing parameters.

## Abstract

Tri-direct CP symmetry is an economical neutrino model building paradigm, and it allows to describe neutrino masses, mixing angles and CP violation phases in terms of four free parameters. Viability of a class of tri-direct CP models is examined with a comprehensive simulation of current and future neutrino oscillation experiments. Two benchmark models as well as the full parameter space are carefully scanned, and the parameter degeneracy problem is observed from the constraint of one group of neutrino oscillation experiments. Complementary roles from the accelerator neutrino experiments (e.g., T2HK and DUNE) and reactor neutrino experiments (e.g., JUNO) are crucial to break the degeneracy and nail down fundamental neutrino mixing parameters of the underlying theory.