# An empirical model to determine the hadronic resonance contributions to $\overline{B}{}^0 \to \overline{K}{} ^{*0} \mu ^+ \mu^-$ transitions

Blake, T; Egede, U; Owen, P; Petridis, K A; Pomery, G (2018). An empirical model to determine the hadronic resonance contributions to $\overline{B}{}^0 \to \overline{K}{} ^{*0} \mu ^+ \mu^-$ transitions. European Physical Journal C - Particles and Fields, 78(6):453.

## Abstract

A method for analysing the hadronic resonance contributions in B¯0→K¯∗0μ+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 B¯0→K¯∗0μ+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 CP-violating effects in the short-distance amplitude. Finally, a study of the hadronic resonance effects on lepton universality ratios, RK(∗), in the presence of new physics is presented.

## Abstract

A method for analysing the hadronic resonance contributions in B¯0→K¯∗0μ+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 B¯0→K¯∗0μ+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 CP-violating effects in the short-distance amplitude. Finally, a study of the hadronic resonance effects on lepton universality ratios, RK(∗), in the presence of new physics is presented.

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