Seesaw mechanism, quark-lepton symmetry and Majorana phases

Details Seesaw mechanism, quark-lepton symmetry and Majorana phases Seesaw mechanism, quark-lepton symmetry and Majorana phases

2000-02-23

arxiv.org/abs/hep-ph/0002242v1

Phys.Lett. B479 (2000) 1-7

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages RevTex, without figures

Scientific paper

10.1016/S0370-2693(00)00354-3

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.

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