Tri-Bimaximal Lepton Mixing and Leptogenesis

[en] 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.

Disciplines :

Physics

Author, co-author :

Aristizabal Sierra, Diego ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules

Bazzocchi, F.

de Medeiros Varzielas, I.

Merlo, L.

Morisi, S.

Language :

English

Title :

Tri-Bimaximal Lepton Mixing and Leptogenesis

Publication date :

March 2010

Journal title :

Nuclear Physics B

ISSN :

0550-3213

eISSN :

1873-1562

Publisher :

Elsevier Science, Amsterdam, Netherlands

Volume :

827

Pages :

34-58

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 20 January 2014

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116 (0 by ULiège)

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Bibliography

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