Exclusive $B^0 \to \pi^- \ell^+ \nu_\ell$ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb$^{-1}$ of Belle II Data
Creators: name: Abudinén, F.
name: Adachi, I.
name: Adak, R.
name: Adamczyk, K.
name: Ahlburg, P.
name: Ahn, J. K.
name: Aihara, H.
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name: Chang, M.-C.
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name: Chen, Y.-T.
name: Cheon, B. G.
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name: Choi, S.-K.
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Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2020

description: We present the results of the re-discovery of the decay $B^0 \to \pi^- \ell^+ \nu_\ell$ in 34.6 fb$^{-1}$ of Belle II data using hadronic $B$-tagging via the Full Event Interpretation algorithm. We observe 21 signal events on a background of 155 in a fit to the distribution of the square of the missing mass, $M_{\mathrm{miss}}^2$, with a significance of 5.69$\sigma$, and determine a total branching fraction of (1.58 $\pm$ 0.43$_{\mathrm{stat}}$ $\pm$ 0.07$_{\mathrm{sys}}$) $\times 10^{-4}$.