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Exclusive B⁰ to π^- ell^+ ν_ell Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb⁻¹ of Belle II Data
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arxiv 2008.08819 v1 pith:FBDKZI5B submitted 2020-08-20 hep-ex
Exclusive B⁰ to π^- ell^+ ν_ell Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb⁻¹ of Belle II Data
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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$_{\mathrm{sys}}$) $\times 10^{-4}$.
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