具有限制阿贝尔对称性的2HDM中的Dirac中微子
Dirac neutrinos in the 2HDM with restrictive Abelian symmetries
摘要：
最近，人们对标准模型的扩展越来越感兴趣，在标准模型中，由于存在一种保护中微子Dirac性的对称性，自然产生了小的Dirac中微子质量。受此启发，我们考虑一个扩展的标准模型与第二个希格斯偶极子（2HDM）和三个右手中微子轻子数是保守的，因此，中微子是狄拉克粒子。在这个框架中，我们确定了最严格的纹理零组合的狄拉克中微子和带电轻子质量矩阵，导致质量和混合与当前的实验数据兼容。然后，我们调查，在一个系统的方式，这些组合可以实现阿贝尔连续U（1）或离散$\mathbb{Z}_N$对称。我们的结论是，从28个最初可能的最大限制轻子质量矩阵集，只有5个有对称实现的2HDM。对于这些情况下，汤川耦合和中微子质量和混合参数之间的一对一的关系建立，和费米子与中性和带电标量的2HDM的相互作用也被确定。本文还讨论了$τ$衰变中轻子普适性和轻子味破坏过程的结果。
英文摘要：
Recently, there has been a growing interest in extensions of the Standard Model in which naturally small Dirac neutrino masses arise due to existence of a symmetry which protects neutrino's Diracness. Motivated by this, we consider an extension of the Standard Model with a second Higgs doublet (2HDM) and three right-handed neutrinos where lepton number is conserved and, thus, neutrinos are Dirac particles. In this framework, we identify the most restrictive texture-zero combinations for the Dirac-neutrino and charged-lepton mass matrices that lead to masses and mixings compatible with current experimental data. We then investigate, in a systematic way, which of these combinations can be realized by Abelian continuous U(1) or discrete $\mathbb{Z}_N$ symmetries. We conclude that, from the 28 initially possible sets of maximally-restricted lepton mass matrices, only 5 have a symmetry realization in the 2HDM. For these cases, one-to-one relations among the Yukawa couplings and the neutrino mass and mixing parameters are established, and the fermion interactions with the neutral and charged scalars of the 2HDM are also determined. Consequences for lepton universality in $τ$ decays and rare lepton-flavor-violating processes are also discussed.
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