Tri/Bi-maximal lepton mixing and leptogenesis

D.A. Sierra, I.D. Varzielas, L. Merlo, S. Morisi

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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/Bi-maximal 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/Bi-maximal 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/Bi-maximal 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/Bi-maximal are connected to the parameters governing leptogenesis. © 2009 Elsevier B.V.
Original languageEnglish
Pages (from-to)34-58
JournalNuclear Physics B
Volume827
Issue number1-2
DOIs
Publication statusPublished - 2010

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