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arXiv 1104.0380hep-ph
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具有S_4味对称性的极小跷跷板模型

Minimal seesaw model with S_4 flavor symmetry

Rui-Zhi Yang, He Zhang

摘要:

在最小跷跷板框架下讨论了一个基于S_4味对称性的中微子质量模型,其中只引入了两个右手中微子,并在S_4味对称性下转化为2。虽然该模型包含较少的自由参数相比,典型的跷跷板模型,它提供了一个成功的描述所观察到的中微子参数,特别是,一个几乎三双峰混合模式可以自然地容纳。此外,重右手中微子的质量被发现是非简并的,而只有正常的分级质谱是兼容的轻中微子的实验。

英文摘要:

We discuss a neutrino mass model based on the S_4 flavor symmetry within the minimal seesaw framework, in which only two right-handed neutrinos are introduced and transform as 2 under S_4. Although the model contains less free parameters compared to the typical seesaw models, it provides a successful description of the observed neutrino parameters, and in particular, a nearly tri-bimaximal mixing pattern can be naturally accommodated. In addition, the heavy right-handed neutrino masses are found to be non-degenerate, while only the normal hierarchical mass spectrum is compatible with experiments for light neutrinos.

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