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arXiv 0903.1940hep-ph
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再论具有S4离散对称性模型中的双峰中微子混合

Revisiting Bimaximal Neutrino Mixing in a Model with S4 Discrete Symmetry

G. Altarelli, F. Feruglio, L. Merlo

摘要:

鉴于中微子混合的数据仍然是兼容的情况下,双峰混合是有效的第一近似,然后纠正条款的Cabibbo角的顺序,所产生的对角化的带电轻子质量,我们构建了一个模型的基础上的离散群S4,这些属性自然实现。该模型在4维中是超对称的,完整的味群是S4 x Z4 x U(1)_FN,这也允许再现带电轻子谱的层次。模型中唯一需要的微调是重现小的观测值r,即中微子质量平方差之间的比值。一旦相关的参数被设置为适应r,那么轻中微子的光谱就显示出一个中等的正常层次,并且在很大的模糊性范围内,与作为宇宙中重子不对称性解释的瘦生的约束是相容的。

英文摘要:

In view of the fact that the data on neutrino mixing are still compatible with a situation where Bimaximal mixing is valid in first approximation and it is then corrected by terms of order of the Cabibbo angle, arising from the diagonalization of the charged lepton masses, we construct a model based on the discrete group S4 where those properties are naturally realized. The model is supersymmetric in 4-dimensions and the complete flavour group is S4 x Z4 x U(1)_FN, which also allows to reproduce the hierarchy of the charged lepton spectrum. The only fine tuning needed in the model is to reproduce the small observed value of r, the ratio between the neutrino mass squared differences. Once the relevant parameters are set to accommodate r then the spectrum of light neutrinos shows a moderate normal hierarchy and is compatible, within large ambiguities, with the constraints from leptogenesis as an explanation of the baryon asymmetry in the Universe.

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