New results on |V_ub| using inclusive and exclusive B decays from the Belle experiment

2023/11/01 by Cao, Lu
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2311.00379

Abstract

We present two recent measurements of semileptonic B decays at Belle, offering valuable insights into the determination of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V_ub|. These analyses use the full Belle dataset, comprising 772 × 10⁶ BB pairs collected at the Υ(4S) resonance. With an innovative strategy, the inclusive B → X_u ℓ ν and exclusive B → πℓ ν decays are simultaneously analyzed for the first time, and the |V_ub| ratio is extracted as |V_ub^excl.|/|V_ub^\mathrm incl.|=0.97 ± 0.12. Furthermore, we provide preliminary results for the inclusive branching fractions ratio of B → X_u ℓ ν and B → X_c ℓ ν decays, accompanied by additional interpretations aimed at deriving the inclusive |V_ub|/|V_cb| ratio.

Related

• Measurements of |V_cb| and |V_ub| from Belle and Belle II
• Semileptonic B decays from Belle and Belle II
• New results on semileptonic B decays from the Belle experiment
• Measurements of |Vub| with Simultaneous Requirements on M_X and q² by Belle
• Measurement of inclusive B → X_u ℓ ν partial branching fractions and |V_ub| at Belle II