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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.15191 |
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| _version_ | 1866914843945074688 |
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| author | Cao, Lu |
| author_facet | Cao, Lu |
| contents | This report 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 $R(D^{*})$ 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 $B^0 \to π^{-} \ell^{+} ν$ and $B^{+} \to ρ^0 \ell^{+} ν$, the $|V_{ub}|$ value is determined incorporating external theoretical constraints on the decay form factors. The first measurement of the full angular coefficients for $B \to D^* \ell ν$ 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 $|V_{ub}|^{\mathrm{incl}}/|V_{cb}|^{\mathrm{incl}}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_15191 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Semileptonic $B$ decays from Belle and Belle II Cao, Lu High Energy Physics - Experiment This report 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 $R(D^{*})$ 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 $B^0 \to π^{-} \ell^{+} ν$ and $B^{+} \to ρ^0 \ell^{+} ν$, the $|V_{ub}|$ value is determined incorporating external theoretical constraints on the decay form factors. The first measurement of the full angular coefficients for $B \to D^* \ell ν$ 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 $|V_{ub}|^{\mathrm{incl}}/|V_{cb}|^{\mathrm{incl}}$. |
| title | Semileptonic $B$ decays from Belle and Belle II |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2406.15191 |