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arXiv 1712.02101hep-ph
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四阶CP对称性的辐射中微子质量

Radiative neutrino masses from order-4 CP symmetry

Igor P. Ivanov

摘要:

4阶广义CP对称性(CP4)在塑造多希格斯模型的标量和夸克扇区方面具有惊人的强大功能。在这里,我们将这个框架扩展到中微子部门。我们建立了两个简单的Majorana中微子质量模型与不间断的CP4,这是类似于马的暗生模型。这两个模型都使用了三个希格斯双重态和两个或三个右手(RH)中微子。最小的CP4对称暗生模型只使用两个RH中微子,导致三个非零轻中微子质量,并包含一个内置的机制,以进一步抑制它们通过相位对齐。有三个RH中微子,一个产生一个I型跷跷板质量矩阵的秩为1,然后由相同的暗生机制校正,自然导致两个中微子质量尺度与温和的层次。这些最小的CP4为基础的建设出现作为一个引物引入额外的对称结构和探索其现象学后果。

英文摘要:

Generalized CP symmetry of order 4 (CP4) is surprisingly powerful in shaping scalar and quark sectors of multi-Higgs models. Here, we extend this framework to the neutrino sector. We build two simple Majorana neutrino mass models with unbroken CP4, which are analogous to Ma's scotogenic model. Both models use three Higgs doublets and two or three right-handed (RH) neutrinos. The minimal CP4 symmetric scotogenic model uses only two RH neutrinos, leads to three non-zero light neutrino masses, and contains a built-in mechanism to further suppress them via phase alignment. With three RH neutrinos, one generates a type I seesaw mass matrix of rank 1, which is then corrected by the same scotogenic mechanism, naturally leading to two neutrino mass scales with mild hierarchy. These minimal CP4-based constructions emerge as a primer for introducing additional symmetry structures and exploring their phenomenological consequences.

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