Leptonic CP Violation in Neutrino Oscillations

One of the main goals of the ongoing and forthcoming neutrino oscillation experiments is to determine the leptonic Dirac CP-violating phase δ , which is one of the fundamental constants in Nature. We first examine the radiative corrections to δ , which should be taken into account when one confronts the theoretical prediction at a high-energy scale with the experimental observations at the low-energy scale. Then, the CP-violating effects in neutrino oscillations in Earth matter are discussed by using neutrino oscillograms. New working observables have been proposed to characterize the intrinsic leptonic CP violation and to optimize the experimental setups.