Determination of from decays using 2019--2021 Belle II data
Sumitted to PubDB: 2022-10-19
Category: Conference papers and plots, Visibility: Public
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Authors |
Philipp Horak,
Christoph Schwanda
|
Date |
Oct. 19, 2022 |
Belle II Number |
BELLE2-CONF-PH-2022-010 |
Abstract |
We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element using the decay based on ~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 is either electron or a muon. The second ~meson in the ~event is not explicitly reconstructed. Using the diamond-frame method, we determine the ~meson four-momentum and thus the hadronic recoil. We extract the partial decay rates as functions of and perform a fit to the decay form-factor and the magnitude of the CKM matrix element using the BGL parameterization of the form factor and lattice QCD input from the FNAL/MILC and HPQCD collaborations. We obtain \resVcb, where is an electroweak correction, and the error accounts for theoretical and experimental sources of uncertainty. |
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