Constraints on the malaphoric model from di-lepton resonance searches at the LHC

We confront the malaphoric $$ model with bounds coming from a search for resonances in the di-lepton channels at the 13 TeV LHC. In contrast to the original $$ model, the $$ of the malaphoric $$ model has sizeable couplings to the lighter two families; these originate from order unity kinetic mixing with the hypercharge gauge boson and ameliorate the fit to lepton flavour universality measurements in B-meson decays. The $$ coupling to the first two families of quark means that the resulting constraints from resonant di-lepton searches are stronger. Nevertheless, we find that for $$ TeV there remains a non-negligible region of allowed parameter space where the model significantly improves upon several Standard Model predictions for observables involving the $$ transition. We estimate that the 3000 fb $$ HL-LHC will extend this sensitivity to $$ TeV.