Neutrino Mass Matrices from Two Zero 3x2 Yukawa Textures and Minimal d=5 Entries

Abstract

Aiming to relate leptonic CP violating phase $\delta$ to the cosmological CP asymmetry, we study the extension of MSSM by two quasi-degenerate (strictly degenerate at tree level) right-handed neutrinos and consider all possible two texture zero 3x2 Yukawa matrices plus one $\Delta L=2$ dimension five (d=5) operator contributing to the light neutrino mass matrix. We classify all experimentally viable mass matrices, leading to several predictions, and analytically derive predictive relations. We also relate the CP violating $\delta$ phase to the CP phase of the thermal leptogenesis.

Comments: References added. Matched to Int. J. Mod. Phys. A version