Angular analysis of $B^0\to K^{\ast 0}{e}^{+}{e}^{-}$ decays

An angular analysis of $B^0\to K^{\ast 0}{e}^{+}{e}^{-}$ decays is presented using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb${}^{-1}$. The analysis is performed in the region of the dilepton invariant mass squared of 1.1-6.0 GeV${}^2\mathrm{/}{c}^4$. In addition, a test of lepton flavour universality is performed by comparing the obtained angular observables with those measured in $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decays. In general, the angular observables are found to be consistent with the Standard Model expectations as well as with global analyses of other $b\to s{\mathrm{\ell }}^{+}{\mathrm{\ell }}^{-}$ processes, where $\mathrm{\ell }$ is either a muon or an electron. No sign of lepton-flavour-violating effects is observed.