Enhancing sensitivity to leptonic CP violation using complementarity among DUNE, T2HK, and T2HKK

fter the landmark discovery of non-zero θ _13 by the modern reactor experiments, unprecedented precision on neutrino mass-mixing parameters has been achieved over the past decade. This has set the stage for the discovery of leptonic CP violation (LCPV) at high confidence level in the next-generation long-baseline neutrino oscillation experiments. In this work, we explore in detail the possible complementarity among the on-axis DUNE and off-axis T2HK experiments to enhance the sensitivity to LCPV suppressing the θ _23-δ _CP degeneracy. We find that none of these experiments individually can achieve the milestone of 3 σ LCPV for at least 75