Probing CP violation with T2K, NO$\nu$A and DUNE in the presence of non-unitarity

TL;DR

This paper investigates how non-unitary neutrino mixing influences the ability of long-baseline experiments like T2K, NO$ u$A, and DUNE to measure CP violation, highlighting the importance of combined data analysis.

Contribution

It provides a detailed analysis of non-unitarity effects on CP violation measurements and demonstrates the improved sensitivity when combining multiple experiments.

Findings

Non-unitarity introduces degeneracies affecting CP phase measurement.

Combining experiments enhances CP violation sensitivity.

Non-unitarity impacts oscillation probability analyses.

Abstract

The presence of non-unitary neutrino mixing can affect the measurement of the three-neutrino leptonic Dirac CP phase and hamper efforts to probe CP violation due to degeneracies of the extra non-unitary CP phase with the standard CP phase. We study the effect of including non-unitarity on probing CP violation with the long-baseline experiments NO$\nu$A, T2K and DUNE. We analyze the effect of non-unitary mixing at the level of oscillation probabilities associated with the relevant baselines, and present the CP violation sensitivity for the individual experiments and their combination. Our results show that there is an improvement in the CP violation sensitivity of the combination compared to the individual experiments.