Sumitted to PubDB: 2023-09-05

Category: Talk, Visibility: Public

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Authors	Kazuki Kojima
Date	July 18, 2023
Belle II Number	BELLE2-TALK-CONF-2023-097
Abstract	Semileptonic $B$-meson decays allow for determining the magnitudes of the CKM matrix parameters $|V_{cb}|$ and $|V_{ub}|$, two fundamental parameters of the SM flavor sector and to probe the excess rate of semitauonic $B$ decays, which has been consistently above expectations in recent years. Belle II analyses use both exclusive decays such as $B \rightarrow D^{*}\ell^{-}\bar{\nu}_{\ell}$ and $B \rightarrow \pi\ell^{-}\bar{\nu}_{\ell}$ , $X_{c}\ell^{-}\bar{\nu}_{\ell}$ or $X_{u}\ell^{-}\bar{\nu}_{\ell}$ inclusive or final states restricted in phase space. The low-background collision environment, along with the possibility of partially or fully reconstructing one of the two $B$ mesons in the event, offer precisions on $|V_{cb}|$ and $|V_{ub}|$ approaching that of world-best results and provides unique probes of lepton-flavor universality violation.
Conference	Lepton Photon 2023

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