Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +697

A measurement of the ratio of the branching fractions of the $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$ and $B^{+}\to K^{+}{e}^{+}{e}^{-}$ decays is presented using proton-proton colli…