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We propose an idea that the observed CP violation in neutrino oscillation isoriginated from the phase in right-handed neutrino mixing by seesaw mechanism.We add small breaking terms $M_{ij}N_{R_i}N_{R_j} $ in model based on $A_4$symmetry to generate non-diagonal right-handed neutrino mixing, which will givea small correction to TBM mixing via seesaw mechanism with nonzero reactorangle and CP violating phase. We estimate the CP violating phase byinvestigating the process of leptogenesis due to the decay of right-handedneutrino.

CP Violating Phase Originated from Right-handed Neutrino Mixing