Measurements of |V_cb| and |V_ub| from Belle and Belle II

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

paper · doi:10.48550/arxiv.2311.00375

Abstract

This proceeding summarizes recent measurements of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |V_cb| and |V_ub| at the Belle and Belle~II experiments. It provides insights derived from both exclusive and inclusive determinations. Preliminary results from Belle~II are discussed, focusing on B⁰→ D^*-ℓ⁺ ν and B⁰ → π^- ℓ⁺ ν utilizing 189 fb^-1 data collected at the Υ(4S) resonance. This reveals the derived branching fractions and |V_xb|. The shape measurement of B → D^* ℓ ν at Belle extracted |V_cb| employing new lattice-QCD calculations as input and provided additional tests on the universality of light lepton flavors. In the realm of inclusive decay, the measurement for |V_ub| and the differential spectra of B → X_u ℓ ν decays have been performed. This presentation also encapsulates the new analyses of |V_ub|^excl/|V_ub|^incl and |V_ub|^incl/|V_cb|^incl ratios.

Related

• New results on |V_ub| using inclusive and exclusive B decays from the Belle experiment
• Determination of |V_cb| using B→ Dℓν_ℓ Decays at Belle II
• Semileptonic B decays from Belle and Belle II
• Determination of |V_cb| from B→ Dℓν decays using 2019-2021 Belle II data
• Measurement of inclusive B → X_u ℓ ν partial branching fractions and |V_ub| at Belle II