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arXiv 1004.3756hep-ph
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关于形式优势导致的Leptogenesis中CP不对称性的消失

On the Vanishing of the CP Asymmetry in Leptogenesis due to Form Dominance

Sandhya Choubey, S. F. King, Manimala Mitra

摘要:

我们强调,消失的CP不对称leptogenesis,以前观察到的模型与三双极大混合和家庭对称性,可以追溯到一个属性的I型跷跷板机制满足这样的模型称为形式优势,对应的情况下,对角Casas-Ibarra R-矩阵。形式优势导致消失的风味依赖CP不对称性,无论一个有三个双峰混合或家庭对称。成功的leptogenesis需要违反形式优势,但不一定违反三双峰混合。这可以在这样的模型中实现,其中负责三重极大混合的家族对称性被间接实现,并且存在强中微子质量等级,并且形式优势仅被负责最轻中微子质量的右手中微子轻轻打破,就像在受约束的顺序优势中一样。

英文摘要:

We emphasize that the vanishing of the CP asymmetry in leptogenesis, previously observed for models with tri-bimaximal mixing and family symmetry, may be traced to a property of the type I see-saw mechanism satisfied by such models known as Form Dominance, corresponding to the case of a diagonal Casas-Ibarra R-matrix. Form Dominance leads to vanishing flavour-dependent CP asymmetries irrespective of whether one has tri-bimaximal mixing or a family symmetry. Successful leptogenesis requires violation of Form Dominance, but not necessarily violation of tri bimaximal mixing. This may be achieved in models where the family symmetry responsible for tri-bimaximal mixing is implemented indirectly and a strong neutrino mass hierarchy is present with the Form Dominance broken only softly by the right-handed neutrino responsible for the lightest neutrino mass, as in constrained sequential dominance.

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