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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
    Abudinen, F; Adamczyk, K; Aloisio, A; Bansal, S; Bilokin, S; Biswas, D; Bozek, A; Bussino, S; Campajola, M; Cecchi, C; Cervenkov, D; Chang, M. -C; Cho, S. -J; Cremaldi, L. M; Cuesta, D; Cunliffe, S; Czank, T; De La Cruz-Burelo, E; De Nuccio, M; Deschamps, B; Destefanis, M; Di Carlo, S; Eliachevitch, M; Ferlewicz, D; Finocchiaro, G; Fiore, S; Fischer, P; Garmash, A; Getzkow, D; Goldenzweig, P; Gradl, W; Hadjivasiliou, C; Hershenhorn, A; Hohmann, M; Huang, K; Jaffe, D. E; Jia, S; Kim, Y; Korpar, S; Kovalchuk, N; Krizan, P; Kumara, K; Kumita, T; Lanceri, L; Lautenbach, K; Diberder, F. R. Le; Lee, S. C; Leitl, P; Lewis, P. M; Li, C; Li, Y. B; Libby, J; Manfredi, R; Matsuoka, K; Metzner, F; Miller, C; Azmi, K; Grimaldo, J. A. Mora; Nazaryan, G; Nishida, S; Nouxman, M. H. A; Ono, H; Oxford, E. R; Pakhlova, G; Park, S. -H; Paschen, B; Polat, G; Prim, M. T; Reiter, S; Rizzuto, L. B; Rosenfeld, C; Rout, N; Sahoo, D; Sakai, Y; Sangal, A; Shiu, J. -G; Skambraks, S; Smith, K; Soloviev, Y; Stypula, J; Tanaka, S; Tanida, K; Tenchini, F; Tonelli, D; Torassa, E; Uchida, M; Uehara, S; Urquijo, P; Wan, K; Wang, B; Wang, X. L; Webb, J; Wehle, S; Windel, H; Xu, X. P; Yin, J. H; Yuan, W; Zani, L; Zhang, Z; Zhulanov, V

    arXiv (Cornell University), 08/2020
    Journal Article

    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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