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We report a measurement of the branching fraction of inclusive semileptonic$B$ meson decays $B\to X_c\ell\nu\ell$ in $\Upsilon(4S)\to B\bar B$~datarecorded by the Belle II experiment at the SuperKEKB asymmetric-energy $e^+e^-$collider and corresponding to 62.8 fb$^{-1}$ of integrated luminosity. Only acharged lepton (electon or muon) is reconstructed and the signal yield isdetermined from a fit to the lepton momentum distribution in the center-of-massframe of the colliding beams. Averaging the result in the electron and muonchannels, we find ${\cal B}(B\to X_c\ell\nu_\ell) = (9.75\pm0.03(\text{stat})\pm 0.47(\text{sys}))\%$.

Measurement of the inclusive semileptonic $B$ meson branching fraction in 62.8 fb$^{-1}$ of Belle II data