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arXiv 1304.2645hep-ph
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弯曲额外维中具有$S_4$味对称性的Dirac中微子

Dirac Neutrinos with $S_4$ Flavor Symmetry in Warped Extra Dimensions

Gui-Jun Ding, Ye-Ling Zhou

摘要:

在味对称性$S_4\times Z_2\times Z'_2$的基础上,提出了一个具有保管对称性$SU(2)_L\times SU(2)_R\times U(1)_X\times P_{LR}$的扭曲额外维模型,中微子被看作是Dirac粒子.在首阶下,我们精确地导出了民主轻子混合,并且高维算符对所有三个轻子混合角都引入了$λ_c$阶修正,使得与实验结果一致.中微子的质谱被预测为倒置的层次和第二个八分圆的$θ_{23}$是首选。我们建议修改后的民主混合,这是通过置换民主混合矩阵的第二和第三行,应该是一个很好的一阶近似理解相当大的$θ_{13}$和$θ_{23}$的第一个八分圆。讨论了电弱精密测量对模型的约束。此外,我们还研究了中微子和带电轻子扇区中所有可能的剩余对称性$G_ν$和$G_{l}$的轻子混合模式。

英文摘要:

We present a warped extra dimension model with the custodial symmetry $SU(2)_L\times SU(2)_R\times U(1)_X\times P_{LR}$ based on the flavor symmetry $S_4\times Z_2\times Z'_2$, and the neutrinos are taken to be Dirac particles. At leading order, the democratic lepton mixing is derived exactly, and the high dimensional operators introduce corrections of order $λ_c$ to all the three lepton mixing angles such that agreement with the experimental data can be achieved. The neutrino mass spectrum is predicted to be of the inverted hierarchy and the second octant of $θ_{23}$ is preferred. We suggest the modified democratic mixing, which is obtained by permuting the second and the third rows of the democratic mixing matrix, should be a good first order approximation to understanding sizable $θ_{13}$ and the first octant of $θ_{23}$. The constraints on the model from the electroweak precision measurements are discussed. Furthermore, we investigate the lepton mixing patterns for all the possible residual symmetries $G_ν$ and $G_{l}$ in the neutrino and charged lepton sectors, respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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