Tests of Lepton Universality Using 𝐵0→𝐾0𝑆⁢ℓ+⁢ℓ− and 𝐵+→𝐾*+⁢ℓ+⁢ℓ− Decays

Tests of lepton universality in 𝐵0→𝐾0𝑆⁢ℓ+⁢ℓ− and 𝐵+→𝐾*+⁢ℓ+⁢ℓ− decays where ℓ is either an electron or a muon are presented. The differential branching fractions of 𝐵0→𝐾0𝑆⁢𝑒+⁢𝑒− and 𝐵+→𝐾*+⁢𝑒+⁢𝑒− decays are measured in intervals of the dilepton invariant mass squared. The measurements are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 9  fb−1 . The results are consistent with the standard model and previous tests of lepton universality in related decay modes. The first observation of 𝐵0→𝐾0𝑆⁢𝑒+⁢𝑒− and 𝐵+→𝐾*+⁢𝑒+⁢𝑒− decays is reported.