arxiv: 2008.10299 · v4 · ★pith:VOXSQXVAnew · submitted 2020-08-24 · ✦ hep-ex
Measurement of the semileptonic bar{B}⁰ to D^(*+) ell⁻ ν_(ell) branching fraction with fully reconstructed B meson decays and 34.6 fb⁻¹of Belle II data
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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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