Universal Neutrino Mass Hierarchy and Cosmological Baryon Number Asymmetry

Abstract

We conjecture that three light Majorana neutrinos and their right-handed counterparts may have a universal geometric mass hierarchy. Incorporating this phenomenological conjecture with the Fritzsch texture of lepton mass matrices in a simple seesaw mechanism, we show that it is possible to simultaneously account for current neutrino oscillation data and the cosmological baryon number asymmetry via leptogenesis.

Comments: RevTex 8 pages (1 PS figure included). Fig. 1 changed. Accepted for publication in PRD