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We present the first comprehensive tests of light-lepton universality in theangular distributions of semileptonic $B^0$-meson decays to charged spin-1charmed mesons. We measure five angular-asymmetry observables as functions ofthe decay recoil that are sensitive to lepton-universality-violatingcontributions. We use events where one neutral $B$ is fully reconstructed in$\Upsilon\left(4S\right)\to{}B \overline{B}$ decays in data corresponding to$189~\mathrm{fb}^{-1}$ integrated luminosity from electron-positron collisionscollected with the Belle II detector. We find no significant deviation from thestandard model expectations.

Tests of light-lepton universality in angular asymmetries of $B^0 \to D^{*-} \ell \nu$ decays