Seesaw mechanism, quark-lepton symmetry and Majorana phases

Abstract

A previous short analysis of the seesaw mechanism, based on quark-lepton symmetry, experimental data and hierarchical neutrino spectrum, is enlarged to include small but not zero U_{e3}, inverted mass hierarchy, and the qualitative effect of Majorana phases. The structure of the heavy neutrino mass matrix obtained in several cases is discussed. We find two leading forms for this matrix. One is diagonal and stands at the unification scale or above. The other is off-diagonal and stands at the intermediate scale.

16 pages RevTex, without figures

References in corpus (4)

• Neutrino Masses and Mixings: a Theoretical Perspective
• Small entries of neutrino mass matrices
• A simple scheme for masses and mixings of quarks and neutrinos
• Heavy neutrino mass scale and quark-lepton symmetry

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