Neutrino Masses and Mixings in a Predictive SO(10) Model with CKM CP Violation

Abstract

It has recently been shown that a minimal SO(10) model with a single {\bf 10} and single {\bf 126} Higgs field breaking B-L symmetry predicts large solar and atmospheric mixings in agreement with observations if it is assumed that the neutrino mass obeys the type II seesaw formula. No additional symmetries need to be assumed for this purpose. Understanding CP violation in the renormalizable version of the model however requires a significant non-CKM source. In this paper we show that if we extend the model by the inclusion of a heavy {\bf 120} dimensional Higgs field, then it can accomodate CKM CP violation while remaining predictive in the neutrino sector. Among the predictions are:(i) solar mixing angle in the observed range; (ii)θ_{13} in the range of 0.1 to 0.26; (iii) the Dirac phase close to maximal for the central value of the solar mixing angle.

16 pages, 10 figures, Comments are added, Typos are corrected, An erroneous sentence on discrete symmetry is modified, Results are unchanged

References in corpus (2)

• Fermion masses in SUSY SO(10) with type II seesaw: a non-minimal predictive scenario
• Fermion Masses and Flavor Mixing in A Supersymmetric SO(10) Model

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