2021/11/01 by F. Abudinén, Belle II Collaboration, Abudinén, F. +662
Medicine · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2111.00710
openalex publication_date 2021/11/01 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We present a reconstruction in early data of the semileptonic decay B+ → π0 ℓ+ ν_ℓ, and first results of a reconstruction of the decays B+ → ρ0 ℓ+ ν_ℓ and B0 → ρ- ℓ+ ν_ℓ in a sample corresponding to 62.8 fb-1 of Belle II data using hadronic B-tagging via the full-event-interpretation algorithm. We determine the total branching fractions via fits to the distribution of the square of the missing mass, and find B(B+ → π0 ℓ+ ν_ℓ) = (8.29 ± 1.99(stat) ± 0.46(syst)) × 10-5. We obtain 95% CL upper limits on the branching fractions with B(B0 → ρ- ℓ+ ν_ℓ) < 3.37 × 10-4 and B(B+ → ρ0 ℓ+ ν_ℓ) < 19.7 × 10-5. We also obtain an updated branching fraction for the B0 → π- ℓ+ ν_ℓ decay, B(B0 → π- ℓ+ ν_ℓ) = (1.47 ± 0.29(stat) ± 0.05(syst)) × 10-4, based on the sum of the partial branching fractions in three bins of the squared momentum transfer to the leptonic system.