We study the phenomenology of the minimal (2, 2) inverse-seesaw model supplemented with Abelian flavour symmetries. To ensure maximal predictability, we establish the most restrictive flavour patterns which can be realised by those symmetries. This setup requires adding an extra scalar doublet and two complex scalar singlets to the Standard Model, paving the way to implement spontaneous CP violation. It is shown that such CP-violating effects can be successfully communicated to the lepton sector through couplings of the scalar singlets to the new sterile fermions. The Majorana and Dirac CP phases turn out to be related, and the active-sterile neutrino mixing is determined by the active neutrino masses, mixing angles and CP phases. We investigate the constraints imposed on the model by the current experimental limits on lepton flavour-violating decays, especially those on the branching ratio BR(μ → eγ) and the capture rate CR(μ − e, Au). The prospects to further test the framework put forward in this work are also discussed in view of the projected sensitivities of future experimental searches sensitive to the presence of heavy sterile neutrinos. Namely, we investigate at which extent upcoming searches for μ → eγ, μ → 3e and μ − e conversion in nuclei will be able to test our model, and how complementary will future high-energy collider and beam-dump experiments be in that task.

我们研究极小值（2 ，2）补充了Abelian风味对称性的反向跷跷板模型。为了确保最大的可预测性，我们建立了可以通过这些对称性实现的限制性最强的风味模式。此设置需要在标准模型中添加一个额外的标量双峰和两个复杂的标量单峰，从而为实现自发CP违反铺平了道路。结果表明，这种违反CP的效应可以通过将标量单重态与新的无菌费米子耦合而成功地传达到轻子区域。事实证明，马约拉纳邦和狄拉克的CP相是相关的，而无菌中微子的混合是由活性中微子的质量，混合角和CP相决定的。我们研究了当前对轻子味违反衰变的实验限制对模型施加的约束，μ → eγ）和捕获率CR（μ− e， Au）。考虑到未来对重度无菌中微子的存在敏感的实验研究的预期敏感性，还讨论了进一步测试这项工作提出的框架的前景。也就是说，我们调查即将在原子核中对μ → eγ，μ →3 e和μ− e转换进行的搜索将能够测试我们的模型，以及未来的高能对撞机和束流转储实验将如何互补。任务。