Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-06
Nucl.Phys.B827:34-58,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages, 6 figures; version 2: references added, minor corrections
Scientific paper
10.1016/j.nuclphysb.2009.10.009
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.
Bazzocchi Federica
Medeiros Varzielas Ivo de
Merlo Luca
Morisi Stefano
Sierra Diego Aristizabal
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