000002089 001__ 2089
000002089 005__ 20200825123232.0
000002089 037__ $$aBELLE2-CONF-PH-2020-009
000002089 041__ $$aeng
000002089 100__ $$aKyle Amirie 
000002089 245__ $$a Measurement of the semileptonic $\bar{B^0} \rightarrow D^{*} \ell \nu_{\ell}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb$^{-1}$ of Belle~II data
000002089 260__ $$a$$c2020-08-25
000002089 300__ $$a15
000002089 520__ $$aWe 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 4.51 \pm 0.41_{stat} \pm 0.27_{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. 
000002089 700__ $$aFlorian Bernlochner
000002089 700__ $$aRacha Cheaib
000002089 700__ $$aMichael Eliachevitch
000002089 700__ $$aWilliam Sutcliffe
000002089 700__ $$aHannah Wakeling 
000002089 8560_ $$fracha.cheaib@desy.de
000002089 8564_ $$uhttps://docs.belle2.org/record/2089/files/BELLE2-CONF-PH-2020-009.pdf