000003289 001__ 3289
000003289 005__ 20221019091356.0
000003289 037__ $$aBELLE2-CONF-PH-2022-010
000003289 041__ $$aeng
000003289 100__ $$aPhilipp Horak
000003289 245__ $$aDetermination of $|V_{cb}|$ from $B\to D\ell\nu$ decays using 2019--2021 Belle II data 
000003289 260__ $$a$$c2022-10-19
000003289 300__ $$amult. p
000003289 520__ $$aWe present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{cb}$ using the decay $B\to D\ell\nu$ based on $e^+e^-\to\Upsilon(4S)$~data recorded by the Belle II detector and corresponding to \lumi of integrated luminosity. The semileptonic decays \ensuremath{\Bz \to D^{-}(\to K^+ \pi^- \pi^-) \ell^{+} \nu_\ell}\xspace and \ensuremath{\Bp \to \bar D^{0}(\to K^+\pi^-) \ell^{+} \nu_\ell}\xspace are reconstructed, where $\ell$ is either electron or a muon. The second $B$~meson in the $\Upsilon(4S)$~event is not explicitly reconstructed. Using the diamond-frame method, we determine the $B$~meson four-momentum and thus the hadronic recoil. We extract the partial decay rates as functions of $w$ and perform a fit to the decay form-factor and the magnitude of the CKM matrix element $|V_{cb}|$ using the BGL parameterization of the form factor and lattice QCD input from the FNAL/MILC and HPQCD collaborations. We obtain \resVcb, where $\eta_{EW}$ is an electroweak correction, and the error accounts for theoretical and experimental sources of uncertainty.
000003289 700__ $$aChristoph Schwanda
000003289 8560_ $$fphilipp.horak@oeaw.ac.at
000003289 8564_ $$uhttps://docs.belle2.org/record/3289/files/BELLE2-CONF-PH-2022-010.pdf