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arXiv 1306.2358hep-ph
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自发CP破坏的S4中三极大TM1中微子混合

Trimaximal TM1 neutrino mixing in S4 with spontaneous CP violation

Christoph Luhn

摘要:

2012年大亚湾和RENO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,我们提出了直接模型的三极大型TM1中的三双极大克莱因对称性的中微子部门被打破的剩余Z2对称性。在这种情况下,太阳混合角与其三重极大值相比降低了约一度,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破坏狄拉克相增量。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。

英文摘要:

The measurement of the reactor angle by the Daya Bay and RENO experiments in 2012 has ruled out the tri-bimaximal paradigm. Adopting an S4 family symmetry, we propose direct models of the trimaximal type TM1 in which the tri-bimaximal Klein symmetry of the neutrino sector is broken to a residual Z2 symmetry. In such a scenario, the solar mixing angle is decreased compared to its tri-bimaximal value by about one degree, thus bringing it in excellent agreement with experimental observation. The atmospheric mixing angle, on the other hand, depends on the CP violating Dirac phase delta. 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.

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