Ultraviolet Completion of Flavour Models

Abstract

Effective Flavour Models do not address questions related to the nature of the fundamental renormalisable theory at high energies. We study the ultraviolet completion of Flavour Models, which in general has the advantage of improving the predictivity of the effective models. In order to illustrate the important features we provide minimal completions for two known A4 models. We discuss the phenomenological implications of the explicit completions, such as lepton flavour violating contributions that arise through the exchange of messenger fields.

18 pages, 8 figures

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• Effective alignments and the landscape of $S_4$ flavour models
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• The role of lepton flavor symmetries in leptogenesis
• An Overview of Neutrino Mixing
• Testing the minimal $S_4$ model of neutrinos with the Dirac and Majorana phases
• Reconstructing Effective Lagrangians Embedding Residual Family Symmetries
• An extended 3-3-1 model with two scalar triplets and linear seesaw mechanism
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• Fermion masses and mixings and charged lepton flavor violation in a 3-3-1 model with inverse seesaw