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arXiv 0908.2947hep-phhep-th
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从对称性的观点看瘦体发生的限制

Constraints on leptogenesis from a symmetry viewpoint

R. Gonzalez Felipe, H. Serodio

摘要:

研究表明,如果质量矩阵的对称性也是拉格朗日量的剩余对称性,则基于标准模型的拉格朗日量扩展为三个重Majorana右手场的I型跷跷板模型在首阶不具有leptogenesis.特别是,味模型,导致一个质量无关的轻子混合消失leptogenesis CP不对称。基于对称性的论点,我们证明了在这些模型中的Dirac-neutrino Yukawa耦合组合相关的leptogenesis是对角的物理基础上,带电轻子和重Majorana中微子是对角的。

英文摘要:

It is shown that type I seesaw models based on the standard model Lagrangian extended with three heavy Majorana right-handed fields do not have leptogenesis in leading order, if the symmetries of mass matrices are also the residual symmetry of the Lagrangian. In particular, flavor models that lead to a mass-independent leptonic mixing have a vanishing leptogenesis CP asymmetry. Based on symmetry arguments, we prove that in these models the Dirac-neutrino Yukawa coupling combinations relevant for leptogenesis are diagonal in the physical basis where the charged leptons and heavy Majorana neutrinos are diagonal.

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