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The ratio of branching fractions of the decays $\Lambda^{0}_{b}\topK^{-}e^{+}e^{-}$ and $\Lambda^{0}_{b}\to pK^{-}\mu^{+}\mu^{-}$, $R^{-1}_{pK}$,is measured for the first time using proton-proton collision data correspondingto an integrated luminosity of 4.7 $fb^{-1}$ recorded with the LHCb experimentat center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squaredrange $0.1 < q^{2} < 6.0$ $GeV^{2}/c^{4}$ and the $pK^{-}$ mass range$m(pK^{-}) < 2600$ $MeV/c^{2}$, the ratio of branching fractions is measured tobe $R^{-1}_{pK} = 1.17 ^{+0.18}_{-0.16} \pm 0.07$, where the first uncertaintyis statistical and the second systematic. This is the first test of leptonuniversality with b baryons and the first observation of the decay$\Lambda^{0}_{b}\to pK^{-}e^{+}e^{-}$.

Test of lepton universality with $\Lambda^{0}_{b} \to p K^- \ell^+ \ell^-$ decays