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arXiv 1408.0785hep-ph
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$S_4$族对称性和广义CP中双峰混合和轻子CP相的偏离

Deviation from Bimaximal Mixing and Leptonic CP Phases in $S_4$ Family Symmetry and Generalized CP

Cai-Chang Li, Gui-Jun Ding

摘要:

轻子味混合矩阵与双极大混合矩阵有一行或一列的共同之处,但仍与现有的中微子振荡数据相一致。我们提供了一个彻底的探索产生这样的混合矩阵从$S_4$家族对称性和广义CP对称性$H_{CP}$。假设$S_4\rtimes H_{CP}$在中微子扇区分解为$Z^{ST^2SU}_2\times H^ν_{CP}$,在带电轻子扇区分解为$Z^{TST^{2}U}_4\rtimes H^{l}_{CP}$,PMNS矩阵的一列将是$\left(1/2, 1/\sqrt{2}, 1/2\right)^{T}$的形式,直到排列,Dirac CP相位和Majorana CP相位都是平凡的,以便容纳所观察到的轻子混合角。研究了中微子扇区中剩余对称性$K^{(TST^2, T^2U)}_4\rtimes H^ν_{CP}$和带电轻子扇区中剩余对称性$Z^{SU}_{2}\times H^{l}_{CP}$的唯象意义。PMNS矩阵的一行被确定为$\left(1/2, 1/2, -i/\sqrt{2}\right)$,并且所有三个轻子CP相位只能是平凡的,以拟合混合角的测量值。基于$S_4$族对称性和广义CP的两个模型被构造来实现这些由剩余对称性强制执行的模型独立预测。在带电轻子之间实现了正确的质量等级。讨论了真空准直和高阶修正。

英文摘要:

The lepton flavor mixing matrix having one row or one column in common with the bimaximal mixing up to permutations is still compatible with the present neutrino oscillation data. We provide a thorough exploration of generating such a mixing matrix from $S_4$ family symmetry and generalized CP symmetry $H_{CP}$. Supposing that $S_4\rtimes H_{CP}$ is broken down to $Z^{ST^2SU}_2\times H^ν_{CP}$ in the neutrino sector and $Z^{TST^{2}U}_4\rtimes H^{l}_{CP}$ in the charged lepton sector, one column of the PMNS matrix would be of the form $\left(1/2, 1/\sqrt{2}, 1/2\right)^{T}$ up to permutations, both Dirac CP phase and Majorana CP phases are trivial in order to accommodate the observed lepton mixing angles. The phenomenological implications of the remnant symmetry $K^{(TST^2, T^2U)}_4\rtimes H^ν_{CP}$ in the neutrino sector and $Z^{SU}_{2}\times H^{l}_{CP}$ in the charged lepton sector are studied. One row of PMNS matrix is determined to be $\left(1/2, 1/2, -i/\sqrt{2}\right)$, and all the three leptonic CP phases can only be trivial to fit the measured values of the mixing angles. Two models based on $S_4$ family symmetry and generalized CP are constructed to implement these model independent predictions enforced by remnant symmetry. The correct mass hierarchy among the charged leptons is achieved. The vacuum alignment and higher order corrections are discussed.

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