Implications of - avored CP symmetry of leptons

We discuss gauge models incorporating �-� avored CP symmetry (called CP �� in the text) in combination with LLinvariance to understand neutrino mixings and discuss their phenomenological implications. We show that viable leptogenesis in this setting requires that the lightest right-handed neutrino mass must be between 10 9 {10 12 GeV and for eective two hierarchical right-handed neutrinos, leptogenesis takes place only in a narrower range of 5� 10 10 {10 12 GeV. A multi-Higgs realization of this idea implies that there must be a pseudoscalar Higgs boson with mass less than 300 GeV. Generically, the vev alignment problem can be naturally avoided in our setting.