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arXiv 1204.0445hep-ph
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轻子混合与离散对称性

Lepton mixing and discrete symmetries

D. Hernandez, A. Yu. Smirnov

摘要:

轻子混合的模式可以通过在中微子和带电轻子汤川扇区中以不同的方式破坏味对称性而出现。在这个框架下,我们推导出的条件施加在混合矩阵的von Dyck型,其中包括A4,S4和A5的离散群的结构。我们表明,在一般情况下,这些条件减少到两个方程的混合参数(角度和CP相位δ)。这些约束,这对应于不间断的剩余对称性,是一致的非零13混合和最大2-3混合的偏差。对于混合角的允许值,我们预测δ= 60 - 90^{ \circ }。

英文摘要:

The pattern of lepton mixing can emerge from breaking a flavor symmetry in different ways in the neutrino and charged lepton Yukawa sectors. In this framework, we derive the conditions imposed on the mixing matrix by the structure of discrete groups of the von Dyck type which include A4, S4 and A5. We show that, in general, these conditions reduce to two equations for the mixing parameters (angles and CP phase δ). These constraints, which correspond to unbroken residual symmetries, are consistent with non-zero 13 mixing and deviations from maximal 2-3 mixing. For the allowed values of mixing angles we predict δ= 60 - 90^{\circ}.

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