Michele Mantovano

23 September 2024
2024 Workshop on Challenges in Semileptonic B Decays

Abstract: We propose a simultaneous analysis of $B\to D\ell\nu$ and $B\to D^*\ell\nu$ decays to measure model-independent observables for the determination of $|V_{cb}|$. The $B\to D^*\ell\nu$ decays is partially reconstructed, removing systematic uncertainty on $|V_{cb}|$ from the soft-pion reconstruction. By assuming equality of the semileptonic decay width of $B^0$ and $B^{+}$ mesons, we can also measure $f_{+-}/f_{00}$, the ratio of the branching fractions of $\Upsilon(4S)$ the decaying into charged and neutral $BB$ pairs. From the model-independent observables, $|V_{cb}|$ and the form-factor parameters of both decays can be determined a-posteriori assuming any form-factor model and lattice data inputs. Using simulation, we present the potential of this analysis with the current Belle II dataset.