Simultaneous analysis of B->Dlnu and B->D*lnu to improve the determination of |Vcb|

Sumitted to PubDB: 2024-10-08

Category: Talk, Visibility: Public

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Authors	Michele Mantovano
Date	Sept. 23, 2024
Belle II Number	BELLE2-TALK-CONF-2024-124
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.
Conference	2024 Workshop on Challenges in Semileptonic B Decays