2020
DOI: 10.48550/arxiv.2008.08819
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Exclusive $B^0 \to π^- \ell^+ ν_\ell$ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb$^{-1}$ of Belle II Data

Abstract: We present the results of the re-discovery of the decay B 0 → π − + ν 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 2 miss , with a significance of 5.69σ, and determine a total branching fraction of (1.58 ± 0.43 stat ± 0.07 sys ) ×10 −4 .

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“…A search for the decay 𝐵 0 → 𝜋 − ℓ + 𝜈 ℓ [8], where ℓ = 𝑒, 𝜇, was performed using hadronic tagging provided by the Full Event Interpretation (FEI) algorithm [9]. The FEI algorithm is a tagging algorithm developed at Belle II that uses machine learning for decay reconstruction.…”
Section: Tagged Exclusive 𝐵mentioning
confidence: 99%
“…A search for the decay 𝐵 0 → 𝜋 − ℓ + 𝜈 ℓ [8], where ℓ = 𝑒, 𝜇, was performed using hadronic tagging provided by the Full Event Interpretation (FEI) algorithm [9]. The FEI algorithm is a tagging algorithm developed at Belle II that uses machine learning for decay reconstruction.…”
Section: Tagged Exclusive 𝐵mentioning
confidence: 99%