Sumitted to PubDB: 2024-06-14

Category: Proceeding, Visibility: Public

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Authors	Lu Cao
Date	2024-06-14
Belle II Number	BELLE2-CONF-PROC-2024-014
Abstract	This proceeding summarizes recent measurements of the CKM matrix elements $|V_{cb}|$, $|V_{ub}|$, and lepton-flavor universality tests in semileptonic B decays from the Belle and Belle~II experiments. The decay branching factions $R(D^{\ast })$ and $R(X)$ are measured with the Belle~II early dataset and the results are found to be consistent with the Standard Model predictions. From a simultaneous measurement of untagged $B^0\to {\pi }^{-}{\ell }^{+}\nu$ and $B^{+}\to {\rho }^0{\ell }^{+}\nu$, the $|V_{ub}|$ value is determined incorporating external theoretical constraints on the decay form factors. The first measurement of the full angular coefficients for $B\to D^{\ast }\ell \nu$ decays at Belle provides comprehensive information for determining the decay form factors and $V_{\mathrm{cb}}$. This presentation also includes measurements of the ratios $|V_{ub}{|}^{\mathrm{excl}}/|V_{ub}{|}^{\mathrm{incl}}$ and $|V_{ub}{|}^{\mathrm{incl}}/|V_{cb}{|}^{\mathrm{incl}}$.

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