Tests of Lepton Universality Using B0→KS0ℓ+ℓ− and <…
Physical Review Letters（2022）
Laboratoire de Physique Corpusculaire | Laboratoire de Physique Nucléaire et de Hautes Énergies | Laboratoire de Physique des 2 Infinis Irène Joliot-Curie | Centre de physique des particules de Marseille | Laboratoire Leprince-Ringuet | Laboratoire d’Annecy de Physique des Particules
Abstract
Tests of lepton universality in B^{0}→K_{S}^{0}ℓ^{+}ℓ^{-} and B^{+}→K^{*+}ℓ^{+}ℓ^{-} decays where ℓ is either an electron or a muon are presented. The differential branching fractions of B^{0}→K_{S}^{0}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 B^{0}→K_{S}^{0}e^{+}e^{-} and B^{+}→K^{*+}e^{+}e^{-} decays is reported.
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