Measurement of b → u ℓ ν at Belle II

2021/03/03 by Fodor, Andrea
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2103.02629

Abstract

The semileptonic B meson decays of the type B → X_u ℓ ν are important for measuring the magnitude of the CKM matrix element V_ub. Recent measurements of inclusive B → X_u e ν_e and hadronically tagged B⁰ → π^- ℓ⁺ ν from the Belle II experiment are presented. The results are obtained using the data collected at Belle II between March 2019 and March 2020, with a total integrated luminosity of 37.8 \rm fb^-1. These preliminary measurements are used to validate the detector and reconstruction software performance. The measured preliminary branching fraction of B⁰ → π^- ℓ⁺ ν decays is (1.58 ± 0.43_\textrmstat ± 0.07_\textrmsys)⋅ 10^-4, which is in agreement with the world average, (1.50 ± 0.06)⋅ 10^-4.

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