000003240 001__ 3240
000003240 005__ 20220921124046.0
000003240 037__ $$aBELLE2-CONF-PH-2022-008
000003240 041__ $$aeng
000003240 100__ $$aNadia Toutounji
000003240 245__ $$aStudy of Exclusive $B \to \pi e^+ \nu_e$ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb$^{-1}$ of Belle II Data
000003240 260__ $$a$$c2022-06-16
000003240 300__ $$amult. p
000003240 520__ $$aWe present a reconstruction of the semileptonic decays $B^0 \to \pi^- e^+ \nu_e$ and $B^+ \to \pi^0 e^+ \nu_e$ in a sample corresponding to 189.3 fb$^{-1}$ of Belle II data, using events where the partner $B$-meson is reconstructed from a large variety of hadronic channels via a tagging algorithm known as the full-event-interpretation. We determine the partial branching fractions in three bins of the squared momentum transfer to the leptonic system using fits to the distribution of the square of the missing mass. The partial branching fractions are summed to determine $\mathcal{B}(B^0 \to \pi^- e^+ \nu_e)$ = (1.43 $\pm$ 0.27(stat) $\pm$ 0.07(syst)) $\times 10^{-4}$ and $\mathcal{B}(B^+ \to \pi^0 e^+ \nu_e)$ = (8.33 $\pm$ 1.67(stat) $\pm$ 0.55(syst)) $\times 10^{-5}$. We extract a first Belle II measurement of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{\mathrm{ub}}|$, with $|V_{\mathrm{ub}}|$ = (3.88 $\pm$ 0.45) $\times 10^{-3}$.
000003240 6531_ $$afull-event-interpretation
000003240 6531_ $$asemileptonic
000003240 6531_ $$aVub
000003240 700__ $$aMoritz Bauer
000003240 700__ $$aPablo Goldenzweig
000003240 700__ $$aKevin Varvell
000003240 8560_ $$fntou5237@uni.sydney.edu.au
000003240 8564_ $$uhttps://docs.belle2.org/record/3240/files/BELLE2-CONF-PH-2022-008.pdf