Belle II results related to $b\to c$ anomalies

We report two new measurements for tests of lepton flavor universality between electrons and muons using semileptonic $B$ decays with a data set of $189{\mathrm{f}\mathrm{b}}^{-1}$ collected at the Belle II experiment between 2019 and 2021. Firstly, we find a ratio of inclusive branching fractions at $R(X_{e\mathrm{/}\mu })\equiv \mathcal{B}(\bar{B}\to X{e}^{-}{\bar{\nu }}_e)\mathrm{/}\mathcal{B}(\bar{B}\to X{\mu }^{-}{\bar{\nu }}_{\mu })=1.007\pm 0.009(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t}\mathrm{.})\pm 0.019(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t}\mathrm{.})$. This inclusive measurement leads to the most precise universality test based on branching fractions. The measured $R(X_{e\mathrm{/}\mu })$ is consistent with the Standard-Model prediction. Secondly, we measure a comprehensive set of five angular asymmetries of ${\bar{B}}^0\to {D^{\ast }}^{+}{\mathrm{\ell }}^{-}{\bar{\nu }}_{\mathrm{\ell }}$ decays and obtain agreements with the Standard Model for the measured asymmetries and their differences at a $p$-value above $13\mathrm{\%}$. From both tests, no evidence of lepton universality violation is found.