We revisit correlations of neutrino oscillation parameters in reactor and long-baseline neutrino oscillation experiments. A framework based on an effective value of θ13 is presented, which can be used to analytically study the correlations and explain some questions including why and when δCP has the best fit value of -π/2, why current and future long-baseline experiments will have less precision of δCP around ±π/2 than that around zero, etc. Recent hints on the CP phase are then considered from the point of view that different reactor and long-baseline neutrino experiments provide currently different best-fit values of θ13 and θ23. We point out that the significance of the hints changes for the different available best-fit values.
Lindner, M., Rodejohann, W., & Xu, X. J. (2018). Neutrino parameters from reactor and accelerator neutrino experiments. Physical Review D, 97(7). https://doi.org/10.1103/PhysRevD.97.075024