Measurement of Angular Coefficients of B → D^* ℓ ν_ℓ: Implications for |V_cb| and Tests of Lepton Flavor Universality

2023/10/31 by M. T. Prim, Belle Collaboration, Prim, M. T. +254
Medicine · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2310.20286

openalex publication_date 2023/10/31 · openalex created_date 2023/11/02 · openalex updated_date 2026/08/03

Abstract

We measure the complete set of angular coefficients J_i for exclusive B → D^* ℓ ν_ℓ decays (ℓ = e, μ). Our analysis uses the full 711 fb^-1 Belle data set with hadronic tag-side reconstruction. The results allow us to extract the form factors describing the B → D^* transition and the Cabibbo-Kobayashi-Maskawa matrix element |V_{\rm cb}|. Using recent lattice QCD calculations for the hadronic form factors, we find |V_{\rm cb}| = (41.0 ± 0.7) × 10³ using the BGL parameterization, compatible with determinations from inclusive semileptonic decays. We search for lepton flavor universality violation as a function of the hadronic recoil parameter w, and investigate the differences of the electron and muon angular distributions. We find no deviation from Standard Model expectations.

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