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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.