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arXiv 1012.2842hep-ph
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小群的三重极大混合

Tribimaximal Mixing From Small Groups

Krishna Mohan Parattu, Akin Wingerter

摘要:

目前的中微子参数的实验数据是在很好的协议与tribimmaximal混合,并可能表明存在一个潜在的家庭对称性。对于76个味组,我们对模型进行了系统的扫描:粒子内容是标准模型加上最多三个flavon场,有效拉格朗日包含质量维度<=6的所有项。我们发现,44组可以容纳的模型是一致的实验在3西格玛,和38组可以有模型,是tribimalamate。对于一个特定的组,我们研究混合角之间的相关性,并对θ 13进行预测,这将在不久的将来得到验证。我们给出了一个θ 12 =33.9,θ 23 =40.9,θ 13 =5.1的模型的细节,以表明最近的非零θ 13的试探性暗示可以很容易地被容纳。我们发现的最小的群是T7。我们认为,T7和T13是适合产生tribimalamentalmixing作为A4,因此应被视为平等的基础上。在附录中,我们提出了一些新的数学方法和结果,可能会被证明是有用的,为未来的模型建设工作。

英文摘要:

Current experimental data on the neutrino parameters is in good agreement with tribimaximal mixing and may indicate the presence of an underlying family symmetry. For 76 flavor groups, we perform a systematic scan for models: The particle content is that of the Standard Model plus up to three flavon fields, and the effective Lagrangian contains all terms of mass dimension <=6. We find that 44 groups can accommodate models that are consistent with experiment at 3 sigma, and 38 groups can have models that are tribimaximal. For one particular group, we look at correlations between the mixing angles and make a prediction for theta13 that will be testable in the near future. We present the details of a model with theta12=33.9, theta23=40.9, theta13=5.1 to show that the recent tentative hints of a non-zero theta13 can easily be accommodated. The smallest group for which we find tribimaximal mixing is T7. We argue that T7 and T13 are as suited to produce tribimaximal mixing as A4 and should therefore be considered on equal footing. In the appendices, we present some new mathematical methods and results that may prove useful for future model building efforts.

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