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arXiv 1111.6262hep-ph
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电弱SU(4)xU(1)规范模型中的五有效算符

Dimension-five effective operators in electro-weak SU(4)xU(1) gauge models

Adrian Palcu

摘要:

本文证明了具有自发对称性破缺的电弱SU(4)LxU(1)X规范模型可以通过简单地利用五维有效算符的树级实现提供一个产生中微子质量的自然框架.我们的方法的新颖之处在于,标量部门不需要被扩大,因为这些运营商被构造为直接产品之间的标量多重已经存在于模型中。在中微子领域,Youkawa耦合有一个独特的通用矩阵。带电轻子已经在它们的对角基中了。这个框架可以导致一个合适的适合的左手中微子的既定现象学,而右手中微子的质量出来在sub-keV区域,独立的截止。后者在理论中引入了一个约为10^12 GeV的中间尺度(然而,它更接近于大统一理论而不是标准模型),这是左手中微子现象学的一个关键成分。

英文摘要:

We prove in this paper that the electro-weak SU(4)L x U(1)X gauge models with spontaneous symmetry breaking can offer a natural framework for generating neutrino masses by simply exploiting the tree level realization of dimension-five effective operators. The novelty of our approach resides in the fact that the scalar sector needs not to be enlarged, since these operators are constructed as direct products among scalar multiplets already existing in the model. There is a unique generic matrix for Youkawa couplings in the neutrino sector. The charged leptons are already in their diagonal basis. This framework can lead to a suitable fit of the established phenomenology for the left-handed neutrinos, while the right-handed neutrino masses come out in the sub-keV region, independently of the cut-off. The latter introduces in the theory an intermediate scale (however, more close to GUT than to SM) at about 10^12GeV which is a crucial ingredient for the left-handed neutrino phenomenology.

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