Sumitted to PubDB: 2023-11-01

Category: Proceeding, Visibility: Public

Tags: -

Authors	Lu Cao
Date	2023-11-01
Belle II Number	BELLE2-CONF-PROC-2023-042
Abstract	This proceeding summarizes recent measurements of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements $|V_{cb}|$ and $|V_{ub}|$ at the Belle and Belle~II experiments. It provides insights derived from both exclusive and inclusive determinations. Preliminary results from Belle~II are discussed, focusing on $B^0\to D^{\ast -}{\ell }^{+}\nu$ and $B^0\to {\pi }^{-}{\ell }^{+}\nu$ utilizing $189{\mathrm{fb}}^{-1}$ data collected at the $\mathrm{{\rm Y}}(4S)$ resonance. This reveals the derived branching fractions and $|V_{xb}|$. The shape measurement of $B\to D^{\ast }\ell \nu$ at Belle extracted $|V_{cb}|$ employing new lattice-QCD calculations as input and provided additional tests on the universality of light lepton flavors. In the realm of inclusive decay, the measurement for $|V_{ub}|$ and the differential spectra of $B\to X_u\ell \nu$ decays have been performed. This presentation also encapsulates the new analyses of $|V_{ub}{|}^{\mathrm{excl}}/|V_{ub}{|}^{\mathrm{incl}}$ and $|V_{ub}{|}^{\mathrm{incl}}/|V_{cb}{|}^{\mathrm{incl}}$ ratios.

• BELLE2-CONF-PROC-2023-042.pdf (versions: 1)
  latest upload: 2024-12-02