OPE parameter determinations from semileptonic B decays at DELPHI

The values of Operator Product Expansion (OPE) parameters mb, mc, μπ2, and ρD have been determined using first three moments of lepton energy spectrum and hadron mass spectrum in semileptonic B hadron decays by the DELPHI Collaboration at LEP. The measurement improves the accuracy of the inclusive determination of the value of |Vcb|. It also tests the consistency of theoretical predictions and the underlying assumptions of the model.