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
Creators: name: Abudinen, F.
name: Adachi, I.
name: Adak, R.
name: Adamczyk, K.
name: Ahlburg, P.
name: Ahn, J. K.
name: Aihara, H.
name: Akopov, N.
name: Aloisio, A.
name: Ameli, F.
name: Andricek, L.
name: Anh Ky, N.
name: Asner, D. M.
name: Atmacan, H.
name: Aulchenko, V.
name: Aushev, T.
name: Aushev, V.
name: Aziz, T.
name: Babu, V.
name: Bacher, S.
name: Baehr, S.
name: Bahinipati, S.
name: Bakich, A. M.
name: Bambade, P.
name: Banerjee, Sw.
name: Bansal, S.
name: Barrett, M.
name: Batignani, G.
name: Baudot, J.
name: Beaulieu, A.
name: Becker, J.
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name: Bender, M.
name: Bennett, J. V.
name: Bernieri, E.
name: Bernlochner, F. U.
name: Bertemes, M.
name: Bessner, M.
name: Bettarini, S.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Bianchi, F.
name: Bilka, T.
name: Bilokin, S.
name: Biswas, D.
name: Bobrov, A.
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name: Bonvicini, G.
name: Bozek, A.
name: Bracko, M.
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name: Briere, R. A.
name: Browder, T. E.
name: Brown, D. N.
name: Budano, A.
name: Burmistrov, L.
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name: Campajola, M.
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name: Caria, G.
name: Casarosa, G.
name: Cecchi, C.
name: Cervenkov, D.
name: Chang, M.-C.
name: Chang, P.
name: Cheaib, R.
name: Chekelian, V.
name: Chen, Y. Q.
name: Chen, Y.-T.
name: Cheon, B. G.
name: Chilikin, K.
name: Chirapatpimol, K.
name: Cho, H.-E.
name: Cho, K.
name: Cho, S.-J.
name: Choi, S.-K.
name: Choudhury, S.
name: Cinabro, D.
name: Corona, L.
name: Cremaldi, L. M.
name: Cuesta, D.
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name: Dash, N.
name: Dattola, F.
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name: De Nuccio, M.
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name: De Sangro, R.
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name: Di Canto, A.
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name: Zani, L.
name: Zhang, J. Z.
name: Zhang, Y.
name: Zhang, Z.
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Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2020

description: 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.