000003954 001__ 3954
000003954 005__ 20231101083408.0
000003954 037__ $$aBELLE2-CONF-PROC-2023-042
000003954 041__ $$aeng
000003954 100__ $$aLu Cao
000003954 245__ $$aMeasurements of $|V_{cb}|$ and $|V_{ub}|$ from Belle and Belle~II
000003954 260__ $$a$$c2023-11-01
000003954 300__ $$a6
000003954 520__ $$aThis 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 $B^0\to D^{*-}\ell^+ \nu$ and $B^{0} \to \pi^{-} \ell^{+} \nu$ utilizing $189 \, \mathrm{fb}^{-1}$ data collected at the $\Upsilon(4S)$ resonance. This reveals the derived branching fractions and $|V_{xb}|$. The shape measurement of $B \to D^{*} \ell \nu$ 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.
000003954 8560_ $$flu.cao@desy.de
000003954 8564_ $$uhttps://docs.belle2.org/record/3954/files/BELLE2-CONF-PROC-2023-042.pdf