CP and Lepton-Number Violation in GUT Neutrino Models with Abelian Flavour Symmetries

Details CP and Lepton-Number Violation in GUT Neutrino Models with Abelian Flavour Symmetries CP and Lepton-Number Violation in GUT Neutrino Models with Abelian Flavour Symmetries

2006-12-21

arxiv.org/abs/hep-ph/0612292v2

JHEP 0707:052,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, 6 figures

Scientific paper

10.1088/1126-6708/2007/07/052

We study the possible magnitudes of CP and lepton-number-violating quantities in specific GUT models of massive neutrinos with different Abelian flavour groups, taking into account experimental constraints and requiring successful leptogenesis. We discuss SU(5) and flipped SU(5) models that are consistent with the present data on neutrino mixing and upper limits on the violations of charged-lepton flavours and explore their predictions for the CP-violating oscillation and Majorana phases. In particular, we discuss string-derived flipped SU(5) models with selection rules that modify the GUT structure and provide additional constraints on the operators, which are able to account for the magnitudes of some of the coefficients that are often set as arbitrary parameters in generic Abelian models.

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