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Abstract:
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.
