Reference : Leptogenesis in the presence of exact flavor symmetries
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Leptogenesis in the presence of exact flavor symmetries
Aristizabal Sierra, Diego mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules >]
Bazzocchi, Federica [SISSA > High energy physics division > > >]
Journal of High Energy Physics
Institute of Physics Publishing (IOP)
Yes (verified by ORBi)
United Kingdom
[en] Flavor symmetries ; Baryon asymmetry ; Leptogenesis
[en] In models with flavor symmetries in the leptonic sector leptogenesis can take place in a very different way compared to the standard leptogenesis scenario. We study the generation of a B−L asymmetry in these kind of models in the flavor symmetric phase pointing out that successful leptogenesis requires (i) the right-handed neutrinos to lie in different irreducible representations of the flavor group; (ii) the flavons to be lighter at least that one of the right-handed neutrino representations. When these conditions are satisfied leptogenesis proceeds due to new contributions to the CP violating asymmetry and — depending on the specific model — in several stages. We demonstrate the validity of these arguments by studying in detail the generation of the B − L asymmetry in a scenario of a concrete A 4 flavor model realization.

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