Tests of Lepton Universality Using B0 ? KS0 â„“+â„“- and B+ ?k*+â„“+â„“- Decays

Abstract

Tests of lepton universality in B0?KS0„“+“- and B+?K*+“+“- decays where“ is either an electron or a muon are presented. The differential branching fractions of B0?KS0e+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?KS0e+e- and B+?K*+e+e- decays is reported.