2005/07/02 by B. Aubert, Aubert, B., Collaboration, BABAR
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.hep-ex/0507017
openalex publication_date 2005/07/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
Charmless semileptonic decays, B → Xu ℓ ν, are studied in a sample of 232 million BB decays recorded with the BaBar detector, in events where the decay of the second B meson is fully reconstructed. Inclusive charmless decays are selected in kinematic regions where the dominant background from semileptonic B decays to charm is reduced by requirements on the hadronic mass MX and the momentum transfer q2. The partial branching fraction for B → Xu ℓ ν decays for MX<1.7 GeV/c2 and q2>8 Gev2/c4 is measured to be Δ\calB(B → Xu ℓ ν) = (0.87 ± 0.09\rm stat± 0.09\rm sys± 0.01\rm th)× 10-3. The CKM matrix element |Vub| is determined by using theoretical calculations of phase space acceptances. Theoretical uncertainties in this extrapolation are reduced by using the inclusive b → s γ photon spectrum and moments of the b → c ℓ ν lepton energy and hadronic invariant mass.