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arXiv 1503.08805hep-ph
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具有点相互作用的Majorana中微子

Majorana neutrinos with point interactions

Chengfeng Cai, Hong-Hao Zhang

摘要:

我们提出了一个现实的模型与马约拉纳中微子的框架内统一的三代费米子的点相互作用在额外的维度。这个模型可以同时解释费米子产生、费米子质量和混合的起源以及马约拉纳中微子质量的微小性。我们表明,有两种机制一起工作,以抑制中微子的质量显着,所以我们不需要引入一个非常大的额外的维截止尺度。一种是I型跷跷板机制,另一种是局域轻子波函数的重叠积分。具有指数状VEV的单重标量在这两种机制中起着核心作用。为了在这个模型中保持一致性,我们引入了一个$U(1)'$规范对称性,它将被单重标量破缺。模型的参数能很好地拟合质量和风味混合数据。这些参数也可以预测所有的CP违反阶段,包括马约拉纳的意外救援质子衰变。

英文摘要:

We propose a realistic model with Majorana neutrinos in the framework of unifying the three generations of fermions by point interactions in an extra dimension. This model can simultaneously explain the origin of fermion generations, fermion masses and mixing, and the smallness of the masses of Majorana neutrinos. We show that there are two mechanisms working together to suppress the neutrino masses significantly, so we do not have to introduce a very large extra-dimension cut-off scale. One is the type-I seesaw mechanism and the other is the overlap integration of localized lepton wave functions. A singlet scalar with an exponential-like VEV plays a central role in these two mechanisms. For consistency in this model we introduce a $U(1)'$ gauge symmetry, which will be broken by the singlet scalar. Parameters of our model can fit the masses and flavor mixing data well. These parameters can also predict all CP violating phases including the Majorana ones and accidentally rescue the proton from decay.

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