Lepton Flavor in Composite Higgs Models

TL;DR

This paper reviews the current status of lepton flavor physics within composite Higgs models, analyzing various flavor scenarios and their implications for lepton flavor violation, dipole moments, and universality tests.

Contribution

It provides a comprehensive analysis of lepton flavor phenomena in composite Higgs models, including recent data and different theoretical frameworks.

Findings

Lepton flavor violating processes impose strong constraints on models.

Predicted effects vary across flavor scenarios and models.

Lepton universality tests are crucial probes of partial compositeness.

Abstract

In this talk, I will present the status of lepton flavor physics in composite Higgs models with partial compositeness in the light of recent data in the lepton sector. I will consider anarchic flavor setups, scenarios with flavor symmetries, and minimal incarnations of the see-saw mechanism that naturally predict non-negligible lepton compositeness. The focus will be on lepton flavor violating processes, dipole moments, and on probes of lepton flavor universality, all providing stringent tests of partial compositeness. The expected size of effects in the different approaches to lepton flavor and the corresponding constraints will be discussed, including "UV complete", effective, and holographic descriptions.