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arXiv 1004.0099hep-ph
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三双极大混合是偶然的吗?

Is the tri-bimaximal mixing accidental?

Mohammed Abbas, A. Yu. Smirnov

摘要:

如果相应的轻子质量矩阵的结构直接遵循某种(剩余或破缺)味对称性,那么三双峰(TBM)混合就不是偶然的。我们开发了一个简单的形式主义,它允许一个分析偏差的中微子质量矩阵的结构上的中微子质量矩阵和基本的味道对称性的轻子混合从TBM的影响。我们发现,可能的偏差从TBM混合可以导致强烈的修改的质量矩阵和强烈违反的TBM质量关系。因此,质量矩阵可能具有元素随机值的“无政府”结构,或者它可能具有不同于TBM对称性的某种对称性。有趣的例子包括纹理为零的矩阵,具有某些“风味对齐”的矩阵以及具有两个分量结构的分层矩阵,其中显性和次显性贡献具有不同的对称性。这为理解轻子混合开辟了新的途径。

英文摘要:

The Tri-bimaximal (TBM) mixing is not accidental if structures of the corresponding leptonic mass matrices follow immediately from certain (residual or broken) flavor symmetry. We develop a simple formalism which allows one to analyze effects of deviations of the lepton mixing from TBM on structure of the neutrino mass matrix and on underlying flavor symmetry. We show that possible deviations from the TBM mixing can lead to strong modifications of the mass matrix and strong violation of the TBM mass relations. As a result, the mass matrix may have an "anarchical" structure with random values of elements or it may have some symmetry which differs from the TBM symmetry. Interesting examples include matrices with texture zeros, matrices with certain "flavor alignment" as well as hierarchical matrices with a two-component structure, where the dominant and sub-dominant contributions have different symmetries. This opens up new approaches to understand the lepton mixing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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