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A simultaneous analysis of the $B^+\to K^+\ell^+\ell^-$ and $B^0\toK^{*0}\ell^+\ell^-$ decays is performed to test muon-electron universality intwo ranges of the square of the dilepton invariant mass, $q^2$. The measurementuses a sample of beauty meson decays produced in proton-proton collisionscollected with the LHCb detector between 2011 and 2018, corresponding to anintegrated luminosity of $9$ $\text{fb}^{-1}$. A sequence of multivariateselections and strict particle identification requirements produce a highersignal purity and a better statistical sensitivity per unit luminosity thanprevious LHCb lepton universality tests using the same decay modes. Residualbackgrounds due to misidentified hadronic decays are studied using data andincluded in the fit model. Each of the four lepton universality measurementsreported is either the first in the given $q^2$ interval or supersedes previousLHCb measurements. The results are compatible with the predictions of theStandard Model.

Measurement of lepton universality parameters in $B^+\to K^+\ell^+\ell^-$ and $B^0\to K^{*0}\ell^+\ell^-$ decays