A method for analysing the hadronic resonance contributions in B̄ ⁰ \!→ K̄ *0 μ ⁺ μ ⁻ decays is presented. This method uses an empirical model that relies on measurements of the branching fractions and polarisation amplitudes of final states involving JPC=1⁻⁻ resonances, relative to the short-distance component, across the full dimuon mass spectrum of B̄ ⁰ \!→ K̄ *0 μ ⁺ μ ⁻ transitions. The model is in good agreement with existing calculations of hadronic non-local effects. The effect of this contribution to the angular observables is presented and it is demonstrated how the narrow resonances in the q² spectrum provide a dramatic enhancement to $$C\!P$$ -violating effects in the short-distance amplitude. Finally, a study of the hadronic resonance effects on lepton universality ratios, R_K(*) , in the presence of new physics is presented.
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