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Tag-side reconstruction is an important method for reconstructing $B$ mesondecays with missing energy. The Belle II tag-side reconstruction algorithm,Full Event Interpretation, relies on a hierarchical reconstruction of $B$ mesondecays with multivariate classification employed at each stage ofreconstruction. Given the large numbers of classifiers employed and decaychains reconstructed, the performance of the algorithm on data and simulationdiffers significantly. Here, calibration factors are derived for hadronictag-side $B$ decays by measuring a signal side decay, $B \rightarrow X\ell\nu$, in $34.6$ fb$^{-1}$ of Belle II data. For a very loose selection on thetag-side $B$ multivariate classifier, the calibration factors are $0.65 \pm0.02$ and $0.83 \pm 0.03$ for tag-side $B^{+}$ and $B^{0}$ mesons,respectively.

A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \rightarrow X\ell \nu$ decays