We measure the complete set of angular coefficients Ji for exclusive B→D*lν decays (l=e, μ). Our analysis uses the full 711  fb^−1 Belle dataset 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 |Vcb|. Using recent lattice QCD calculations for the hadronic form factors, we find |Vcb|=(40.7±0.7)×10^−3 using the Boyd-Grinstein-Lebed parametrization, 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.

Measurement of Angular Coefficients of B→D*lν: Implications for |Vcb| and Tests of Lepton Flavor Universality

Tenchini, F.;
2024-01-01

Abstract

We measure the complete set of angular coefficients Ji for exclusive B→D*lν decays (l=e, μ). Our analysis uses the full 711  fb^−1 Belle dataset 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 |Vcb|. Using recent lattice QCD calculations for the hadronic form factors, we find |Vcb|=(40.7±0.7)×10^−3 using the Boyd-Grinstein-Lebed parametrization, 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.
2024
Prim, M.  T.; Bernlochner, F.; Metzner, F.; Aihara, H.; Asner, D.  M.; Aushev, T.; Ayad, R.; Babu, V.; Banerjee, Sw.; Behera, P.; Belous, K.; Bennett,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1274452
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