We review lepton flavor physics and corresponding observables in the composite Higgs framework with partial compositeness, considering ‘UV complete’ setups as well as effective and holographic approaches. This includes anarchic flavor setups, scenarios with flavor symmetries, and minimal incarnations of the see-saw mechanism that naturally predict non-negligible lepton compositeness. We focus on lepton flavor violating processes, dipole moments, and on probes of lepton flavor universality, all providing stringent tests of partial compositeness. We discuss the expected size of effects in the different approaches to lepton flavor, which will be useful to understand how a composite lepton sector could look like, given up-to-date experimental constraints.

我们回顾了具有部分复合性的复合希格斯框架中的轻子风味物理和相应的可观察量，考虑到“UV 完全”设置以及有效的全息方法。这包括无政府主义的风味设置、具有风味对称性的场景，以及自然预测不可忽略的轻子复合性的跷跷板机制的最小化身。我们专注于轻子风味违反过程、偶极矩和轻子风味普遍性的探索，所有这些都提供了部分复合性的严格测试。我们讨论了轻子风味的不同方法的预期效应大小，这将有助于理解复合轻子扇区在最新实验约束下的外观。