Flavor Physics and Flavor Anomalies in Minimal Fundamental Partial Compositeness

TL;DR

This paper explores a UV-complete model of partial compositeness with a new strongly coupled gauge interaction, analyzing its flavor structure, constraints, and potential to explain recent lepton flavor universality violations in B decays.

Contribution

It provides a detailed flavor analysis of a minimal UV completion of partial compositeness, identifying viable parameter regions and explaining certain B decay anomalies.

Findings

CP violation in kaon mixing constrains the model

Many parameter points satisfy all precision tests

The model can explain hints of lepton flavor universality violation in B decays

Abstract

Partial compositeness is a key ingredient of models where the electroweak symmetry is broken by a composite Higgs state. Recently, a UV completion of partial compositeness was proposed, featuring a new strongly coupled gauge interaction as well as new fundamental fermions and scalars. We work out the full flavor structure of the minimal realization of this idea and investigate in detail the consequences for flavor physics. While CP violation in kaon mixing represents a significant constraint on the model, we find many viable parameter points passing all precision tests. We also demonstrate that the recently observed hints for a violation of lepton flavor universality in $B\to K^{(*)}\ell\ell$ decays can be accommodated by the model, while the anomalies in $B\to D^{(*)}\tau\nu$ cannot be explained while satisfying LEP constraints on $Z$ couplings.