Article

# Tri-Bimaximal Lepton Mixing and Leptogenesis

08/2009; DOI:doi:10.1016/j.nuclphysb.2009.10.009
Source: arXiv

ABSTRACT In models with flavour symmetries added to the gauge group of the Standard Model the CP-violating asymmetry necessary for leptogenesis may be related with low-energy parameters. A particular case of interest is when the flavour symmetry produces exact Tri-Bimaximal lepton mixing leading to a vanishing CP-violating asymmetry. In this paper we present a model-independent discussion that confirms this always occurs for unflavoured leptogenesis in type I see-saw scenarios, noting however that Tri-Bimaximal mixing does not imply a vanishing asymmetry in general scenarios where there is interplay between type I and other see-saws. We also consider a specific model where the exact Tri-Bimaximal mixing is lifted by corrections that can be parametrised by a small number of degrees of freedom and analyse in detail the existing link between low and high-energy parameters - focusing on how the deviations from Tri-Bimaximal are connected to the parameters governing leptogenesis. Comment: 29 pages, 6 figures; version 2: references added, minor corrections

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5 Nov 2012

### Keywords

6 figures

CP-violating asymmetry necessary

degrees

deviations

exact Tri-Bimaximal

exact Tri-Bimaximal lepton

flavour symmetries

flavour symmetry

gauge group

minor corrections

model-independent discussion

models

particular case

specific model

Standard Model

Tri-Bimaximal

unflavoured leptogenesis

vanishing asymmetry

vanishing CP-violating asymmetry