On the IR/UV flavour connection in non-universal axion models

Non-universal axion models, with the Peccei-Quinn (PQ) symmetry acting on Standard Model (SM) fermions in a generation-dependent way, are typically accompanied by two different sources of flavour violation, dubbed here as infrared (IR) and ultraviolet (UV). The former is due to violating couplings SM fermions, while latter arises from heavy degrees freedom that UV complete effective field theory. We point out these violation directly related exemplify this connection general class non-universal model, based renormalizable DFSZ-like setup Higgs doublets (PQ-2HDM). next discuss interplay phenomenology signatures stemming radial modes PQ-2HDM, including meson oscillation observables charged lepton decays. emphasize strong complementarity between observables, LHC direct searches standard physics.