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Preprints Archive: Abstract of IC2010021 (2010)

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Bridging flavour violation and leptogenesis in SU(3) family models

by Lorenzo Calibbi, Eung Jin Chun and Liliana Velasco-Sevilla

Document info: Pages 26, Figures 3.

We reconsider basic, in the sense of minimal field content, Pati-Salam $\times$ SU(3) family models which make use of the Type I see-saw mechanism to reproduce the observed mixing and mass spectrum in the neutrino sector. The goal of this is to achieve the observed baryon asymmetry through the thermal decay of the lightest right-handed neutrino and at the same time to be consistent with the expected experimental lepton flavour violation sensitivity. This kind of models have been previously considered but it was not possible to achieve a compatibility among all of the ingredients mentioned above. We describe then how different $SU(3)$ messengers, the heavy fields that decouple and produce the right form of the Yukawa couplings together with the scalars breaking the $SU(3)$ symmetry, can lead to different Yukawa couplings. This in turn implies different consequences for flavour violation couplings and conditions for realizing the right amount of baryon asymmetry through the decay of the lightest right-handed neutrino. Also a highlight of the present work is a new fit of the Yukawa textures traditionally embedded in $SU(3)$ family models.

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