Year: 2009
Type: article
Abstract: We model tribimaximal lepton mixing from first principles in a way that avoids the problem of the vacuum alignment characteristic of such models. This is achieved by using a softly broken ${A}_{4}$ symmetry realized with an isotriplet fermion, also triplet under ${A}_{4}$. No scalar ${A}_{4}$ triplet is introduced. This represents one possible realization of general schemes characterized by the minimal set of either three or five physical parameters. In the three parameter versions the neutrinoless double beta mass parameter ${m}_{ee}$ vanishes, while in the five parameter schemes the absolute scale of neutrino mass, although not predicted, is related to the two Majorana phases. The model realization we discuss is potentially testable at the LHC through the peculiar leptonic decay patterns of the fermionic and scalar triplets.
Authors: M. Hirsch, S. Morisi, J. W. F. Valle
Institutions: Universitat de València, Instituto de Física Corpuscular
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1970731366