Calculable CP-violating Phases in the Minimal Seesaw Model of Leptogenesis and Neutrino Mixing

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We show that all nontrivial CP-violating phases can be determined in terms of three lepton flavor mixing angles and the ratio of Δm² sun to Δm² atm in the minimal seesaw model in which the Frampton-Glashow-Yanagida (FGY) ansatz is incorporated. This important point allows us to make very specific predictions for the cosmological baryon number asymmetry and CP violation in neutrino oscillations. A measurement of the smallest neutrino mixing angle will sensitively test the FGY ansatz, in particular in the case that three light neutrinos have a normal mass hierarchy.