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arXiv 1005.5563hep-ph
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SU(3)族模型中味破坏和瘦生的桥接

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

Lorenzo Calibbi, Eung Jin Chun, Liliana Velasco-Sevilla

摘要:

我们重新考虑基本的,在这个意义上的最小场含量,Pati-Salam x SU(3)家族模型,利用I型跷跷板机制,以重现所观察到的混合和质量谱的中微子部门。这样做的目的是通过最轻的右手中微子的热衰变来实现观察到的重子不对称性,同时与预期的实验轻子味违反灵敏度相一致。这种模型以前已经考虑过,但不可能实现上述所有成分之间的兼容性。然后,我们描述了不同的SU(3)信使,重场解耦和产生正确形式的汤川耦合与标量打破SU(3)对称性,可以导致不同的汤川耦合。这反过来又意味着不同的后果味违反耦合和条件,实现适量的重子不对称性,通过衰变的最轻的右手中微子。本工作的另一个亮点是传统上嵌入SU(3)族模型中的Yukawa纹理的新拟合。

英文摘要:

We reconsider basic, in the sense of minimal field content, Pati-Salam x 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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