000002237 001__ 2237
000002237 005__ 20210228020631.0
000002237 037__ $$aBELLE2-CONF-PROC-2021-005
000002237 041__ $$aeng
000002237 100__ $$aAndrea Fodor
000002237 245__ $$aMeasurement of $b \to u \ell \nu_{\ell}$ at Belle II
000002237 260__ $$a$$c2021-02-24
000002237 300__ $$a7
000002237 500__ $$aBEAUTY2020 proceedings
000002237 520__ $$aThe semileptonic $B$ meson decays of the type $B \to X_u \ell \nu$ are important for measuring the $|V_{ub}|$ CKM matrix element. Recent measurements of inclusive $B \to X_u e \nu_e$ and hadronic-tagged $B^0 \to \pi^- \ell^+ \nu$ from the Belle II experiment are presented. The results are obtained using the data collected at Belle II between March 2019 and March 2020, with the total luminosity of 37.8~fb$^{-1}$. These preliminary measurements are used to validate the detector and reconstruction software performance. The measured preliminary branching fraction of $B^0 \to \pi^- \ell^+ \nu$, equal to $(1.58 \pm 0.43_{\textrm{stat}} \pm 0.07_{\textrm{sys}})\cdot 10^{-4}$, is in agreement with the world average. 
000002237 8560_ $$fafodor@physics.mcgill.ca
000002237 8564_ $$uhttps://docs.belle2.org/record/2237/files/BELLE2-CONF-PROC-2021-005.pdf