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arXiv 0902.2849hep-ph
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基于S4的模型中跷跷板的现象学后果

Phenomenological Consequences of See-Saw in S4 Based Models

F. Bazzocchi, L. Merlo, S. Morisi

摘要:

提出了一个基于对称群S4的味模型,设法描述费米子质量和混合。Weinberg算符被用来提供中微子质量的小性,而一组标量场,得到非零真空期望值,自发地分解S4,并提供三-双极大模式作为轻子混合矩阵。限制到这种设置,在本文中,我们分析了可能的起源的有效条款:I型跷跷板机制是最有名的方法,但也讨论了II型和III型。与这些模型相关的现象学是各种各样的,未来的实验原则上可以区分这些建议。此外,我们比较了我们的实现与两个相关的基于A4的模型,也预测了三-双最大轻子混合,我们发现,对中微子双β衰变参数的分析可以区分所有这些实现。此外,对有效质量和最轻中微子质量的联合测量可能会在不久的将来表明哪一个是首选的味对称群。标准模型之外的新物理的引入,如重右手中微子,标量三胞胎和费米子三胞胎,让我们调查leptogenesis,这提供了实现模型的限制。

英文摘要:

It was proposed a flavour model based on the symmetry group S4, managing to describe fermion masses and mixings. The Weinberg operator has been used in order to provide the smallness of the neutrino masses, while a set of scalar fields, getting non-vanishing vacuum expectation values, spontaneously breaks down S4 and provides the Tri-Bimaximal pattern as the lepton mixing matrix. Restricting to this setting, in this paper we analyze possible origins for the effective terms: the type I See-Saw mechanism is the best known approach, but also the type II and III are discussed. The phenomenology related to these models is various and the next future experiments could in principle discriminate among these proposals. Furthermore, we compare our realizations to two relevant A4 based models, also predicting the Tri-Bimaximal lepton mixing, and we find that an analysis on the neutrinoless double beta decay parameters could distinguish among all these realizations. Furthermore a combined measurement of the effective mass and of the lightest neutrino mass could indicate in the next future which is the preferred flavour symmetry group. The introduction of new physics beyond the Standard Model, like heavy right-handed neutrinos, scalar triplets and fermion triplets, let us investigate on leptogenesis and this provides constraints in the realization of the models.

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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