Measurement of the semileptonic B⁰ → D^*+ ℓ^- ν_ℓ branching fraction with fully reconstructed B meson decays and 34.6 fb^-1of Belle II data

2020/08/24 by Belle II Collaboration, Abudinen, F., Adachi, I. +540
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2008.10299

Abstract

We present a first measurement of the B⁰ → D^*+ ℓ^- ν_ℓ branching fraction using fully reconstructed B meson decays employing the Full Event Interpretation algorithm. Collision events corresponding to an integrated luminosity of \lumi are analyzed, which were recorded by the Belle~II detector operated at the SuperKEKB accelerator complex. We measure\calB(B⁰ → D^*+ ℓ^- ν_ℓ) =4.51 ± 0.41_stat±0.27_syst ±0.45_πs, with the first and second error denoting the statistical and systematic uncertainty, respectively, and the third dominant uncertainty is from the slow pion reconstruction efficiency.

Related

• Studies of the semileptonic B⁰→ D^*+ℓ^-ν_ℓ and B^-→ D⁰ℓ^-ν_ℓ decay processes with 34.6 fb^-1 of Belle II data
• Measurement of the branching fraction \cal B( B⁰→ D^*+ℓ^-ν_ℓ) with early Belle II data
• Measurement of b → u ℓ ν at Belle II
• Measurement of the inclusive semileptonic B meson branching fraction in 62.8 fb^-1 of Belle II data
• Measurement of Exclusive B → X_u ℓ ν Decays with D^(*) ℓ ν Decay Tagging