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Article
Report number	hep-ph/0612292 ; CERN-PH-TH-2006-181 ; CERN-PH-TH-2006-181
Title	CP and Lepton-Number Violation in GUT Neutrino Models with Abelian Flavour Symmetries
Related title	CHARGE PARITY GRAND UNIFIED THEORIES FLAVOR
Author(s)	Ellis, John R. (CERN) ; Gomez, Mario E. (Huelva U.) ; Lola, Smaragda (Patras U.)
Affiliation	(CERN)
Publication	2007
Imprint	21 Dec 2006
Number of pages	28
In:	JHEP 07 (2007) 052
DOI	10.1088/1126-6708/2007/07/052
Subject category	Particle Physics - Phenomenology
Abstract	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.
Copyright/License	Open Access

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