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Discriminating Majorana neutrino phases in the light of lepton flavor violation and leptogenesis in type I plus II seesaw models

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WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217751X15501304

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Neutrino mixing; leptogenesis; lepton flavor violation

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We study the effects of Majorana neutrino phases in lepton flavor violation and the origin of matter-antimatter asymmetry through the mechanism of leptogenesis within the framework of a model where both type I and type II seesaw mechanisms can contribute to tiny neutrino masses. We parametrize the type I seesaw mass matrix by assuming it to give rise to a tri-bimaximal (TBM) type neutrino mixing which predicts theta(13) = 0. The type II seesaw mass matrix is then constructed in such a way that the necessary deviation from TBM mixing and the best fit values of neutrino parameters can be obtained when both type I and type II seesaw contributions are taken into account. Considering both subleading as well as equally dominating type II seesaw term, we first constrain the Majorana CP phases from the requirement of producing correct baryon asymmetry through leptogenesis and then incorporating the experimental bounds on lepton flavor violating decays mu -> e + gamma and mu -> e + e + e.

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