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

Abstract

We show that all nontrivial CP-violating phases can be determined in terms of three lepton flavor mixing angles and the ratio of $\Delta m_{\mathrm{sun}}^2$ to $\Delta m_{\mathrm{atm}}^2$ 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.

Comments: RevTex 13 pages (3 PS figures included). A new figure and references added