U(2)-like flavor symmetries and approximate bimaximal neutrino mixing
U(2)-like flavor symmetries and approximate bimaximal neutrino mixing
复制标题
类 U(2) 风味对称性和近似双极中微子混合
DOI：
10.1103/physrevd.65.013011
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发表时间：
2001
影响因子：
5
通讯作者：
P. Meade
中科院分区：
文献类型：
--
作者：
A. Aranda;C. Carone;P. Meade
涉及U(2)味道对称性的模型，或它的任何一个非阿贝尔离散子群，都可以解释观察到的带电费米子质量和CKM角的等级。我们知道，在这些模型中，在没有微调参数的情况下，连接第二代和第三代场的大的中微子混合角可能会通过跷跷板机制出现。在这里，我们证明了在一类具有U(2)类Yukawa纹理的模型中可以获得近似的双极大混合。我们找到了导致两个大混合角的Dirac和Majorana中微子质量矩阵的最小形式，并表明我们的结果可以定量地解释大气中微子振荡，同时适应太阳中微子问题的有利的大角度MSW解。我们通过一些明确的例子证明了这些纹理可以在模型中出现。
Models involving a U(2) flavor symmetry, or any of a number of its non-Abelian discrete subgroups, can explain the observed hierarchy of charged fermion masses and CKM angles. It is known that a large neutrino mixing angle connecting second and third generation fields may arise via the seesaw mechanism in these models, without a fine tuning of parameters. Here we show that it is possible to obtain approximate bimaximal mixing in a class of models with U(2)-like Yukawa textures. We find a minimal form for Dirac and Majorana neutrino mass matrices that leads to two large mixing angles, and show that our result can quantitatively explain atmospheric neutrino oscillations while accommodating the favored, large angle MSW solution to the solar neutrino problem. We demonstrate that these textures can arise in models by presenting a number of explicit examples.