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We study two related universal anomalies of the spectral function ofcuprates, so called waterfall and high-energy kink features, by a combinedcellular dynamical mean-field theory and angle-resolved photoemission study forthe oxychloride Na$_x$Ca$_{2-x}$CuO$_2$Cl$_2$ (Na-CCOC). Tracing their originback to an interplay of spin-polaron and local correlation effects both inundoped and hole-doped (Na-)CCOC, we establish them as a universal crossoverbetween regions differing in the momentum-dependence of the coupling and notnecessarily in the related quasiparticles' energies. The proposed scenarioextends to doping levels coinciding with the cuprate's superconducting dome andmotivates further investigations of the fate of spin-polarons in thesuperconducting phase.

On the cuprates' universal waterfall feature: evidence of a momentum-driven crossover