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Measurement of the semileptonic $\bar{B}^0 \to D^{*+} \ell^{-} \nu_{\ell}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb$^{-1}$of Belle II data
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arxiv 2008.10299 v4 pith:VOXSQXVA submitted 2020-08-24 hep-ex
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abstract
We present a first measurement of the $\bar{B^{0}} \rightarrow D^{*+} \ell^{-} \nu_{\ell}$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Interpretation algorithm. Collision events corresponding to an integrated luminosity of \lumi are analyzed, which were recorded by the Belle~II detector operated at the SuperKEKB accelerator complex. We measure$\cal{B}(\bar{B^{0}} \rightarrow D^{*+} \ell^{-} \nu_{\ell}) =4.51 \pm 0.41_{stat}\pm0.27_{syst} \pm0.45_{\pi_s}$, with the first and second error denoting the statistical and systematic uncertainty, respectively, and the third dominant uncertainty is from the slow pion reconstruction efficiency.
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Form factors for semileptonic B(s) -> D*(s) l nu_l decays
hep-lat 2024-12 accept novelty 5.0 of 10
RBC/UKQCD presents preliminary, unrenormalized lattice form factors for B_s to D*_s semileptonic decay on a single ensemble, covering a q^2 range similar to published calculations.
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