M. Hirsch, J. Romão, S. Skadhauge, J. Valle, Albert Villanova del Moral
We investigate the supersymmetric A_4 model recently proposed by Babu, Ma and Valle. The model naturally gives quasi-degenerate neutrinos that are bi-largely mixed, in agreement with observations. Furthermore, the mixings in the quark sector are constrained to be small, making it a complete model of the flavor structure. Moreover, it has the interesting property that CP-violation in the leptonic sector is maximal (unless vanishing). The model exhibit a close relation between the slepton and lepton sectors and we derive the slepton spectra that are compatible with neutrino data and the present bounds on flavor-violating charged lepton decays. The prediction for the branching ratio of the decay tau -> mu gamma has a lower limit of 10^{-9}. In addition, the overall neutrino mass scale is constrained to be larger than 0.3 eV. Thus, the model will be tested in the very near future.
我们研究了最近由Babu, Ma和Valle提出的超对称A_4模型。该模型自然地给出了双基本混合的准简并中微子，与观测结果一致。此外，夸克扇区的混合被限制在很小的范围内，使其成为风味结构的完整模型。此外，它还具有一个有趣的性质，即在轻子扇区中cp -违和是极大的(除非消失)。该模型显示了睡眠子和轻子扇区之间的密切关系，并推导出与中微子数据和当前违反风味的带电轻子衰变边界相容的睡眠子谱。对衰变tau -> mu -的分支比的预测下限为10^{-9}。此外，中微子的整体质量尺度被限制在0.3 eV以上。因此，该模型将在不久的将来接受测试。
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