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arXiv 0801.2775hep-ph
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族对称性与费米子质量和混合的起源

Family symmetries and the origin of fermion masses and mixings

Ivo de Medeiros Varzielas

摘要:

族对称性可能是标准模型最保守的扩展,它试图解释费米子质量和混合的模式。在轻子扇区中观察到的大混合角可能是存在非阿贝尔族对称性的第一个信号。我们调查的可能性,同时解释所观察到的模式的质量的夸克(分级质量和小混合角)和轻子(近三双最大混合,因此大混合角)。我们表明,这样的对比观察可以通过跷跷板机制自然地实现,无论是在连续或离散的家庭对称性的模型。我们也认为在一些细节的约束,口味变化的中性电流所产生的连续家庭的对称性。我们表明,对于一个有限的选择的flavon部门,连续的家庭对称性是一致的,即使是最保守的限制的情况下,规范介导的超对称性破缺和引力介导的超对称性破缺。

英文摘要:

Family symmetries are possibly the most conservative extension of the Standard Model that attempt explanations of the pattern of fermion masses and mixings. The observed large mixing angles in the lepton sector may be the first signal for the presence of a non-Abelian family symmetry. We investigate the possibilities of simultaneously explaining the observed pattern of masses of the quarks (hierarchical masses and small mixing angles) and of the leptons (near tri-bi-maximal mixing, thus large mixing angles). We show that such contrasting observations can be achieved naturally via the seesaw mechanism, whether in models with continuous or discrete family symmetries. We consider also in some detail the constraints on flavour changing neutral currents arising from introducing a continuous family symmetry. We show that, for a restricted choice of the flavon sector, continuous family symmetries are consistent with even the most conservative limits both for the case of gauge mediated supersymmetry breaking and the case of gravity mediated supersymmetry breaking.

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