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We further investigate the case where new physics in the form of a massive$Z^\prime$ particle explains apparent measurements of lepton flavournon-universality in $B \rightarrow K^{(\ast)} l^+ l^-$ decays. Hadron collidersensitivities for direct production of such $Z^\prime$s have been previouslystudied in the narrow width limit for a $\mu^+ \mu^-$ final state. Here, weextend the analysis to sizeable decay widths and improve the sensitivityestimate for the narrow width case. We estimate the sensitivities of the highluminosity 14 TeV Large Hadron Collider (HL-LHC), a high energy 27 TeV LHC(HE-LHC), as well as a potential 100 TeV future circular collider (FCC). TheHL-LHC has sensitivity to narrow $Z^\prime$ resonances consistent with theanomalies. In one of our simplified models the FCC could probe 23 TeV$Z^\prime$ particles with widths of up to 0.35 of their mass at 95\% confidencelevel (CL). In another model, the HL-LHC and HE-LHC cover sizeable portions ofparameter space, but the whole of perturbative parameter space can be coveredby the FCC.

Hadron Collider Sensitivity to Fat Flavourful $Z^\prime$s for $R_{K^{(\ast)}}$