Trimaximal TM 1 neutrino mixing in S 4 with spontaneous CP violation
Trimaximal TM 1 neutrino mixing in S 4 with spontaneous CP violation
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DOI：
10.1016/j.nuclphysb.2013.07.003
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
C. Luhn
中科院分区：
文献类型：
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作者：
C. Luhn
2012年大亚湾和里诺实验对反应堆角度的测量排除了三双峰范式。采用S4族对称性，我们提出了三极大型TM 1的直接模型，其中中微子扇区的三极大Klein对称性被破缺为剩余的Z2对称性.在这种情况下，太阳混合角与其三重极大值相比减少了约1°，从而使其与实验观测非常一致。另一方面，大气混合角取决于CP破坏狄拉克相δ。施加CP保守的家庭对称性的限制，我们展示了如何打破CP对称性通过flavon VEVs与定义良好的复杂的相位，使大气的角度从最大的混合，符合最新的全球拟合，产生相当大的偏差。
The measurement of the reactor angle by the Daya Bay and RENO experiments in 2012 has ruled out the tri-bimaximal paradigm. Adopting an S 4 family symmetry, we propose direct models of the trimaximal type TM 1 in which the tri-bimaximal Klein symmetry of the neutrino sector is broken to a residual Z 2 symmetry. In such a scenario, the solar mixing angle is decreased compared to its tri-bimaximal value by about 1°, thus bringing it in excellent agreement with experimental observation. The atmospheric mixing angle, on the other hand, depends on the CP violating Dirac phase δ. Imposing CP conservation in the family symmetry limit, we show how to break the CP symmetry via flavon VEVs with well-defined complex phases, so that sizable deviations of the atmospheric angle from maximal mixing, consistent with the latest global fits, are produced.