Finite energy sum rules for the cross section of e+e−-annihilation into hadrons in QCD

AbstractFinite energy sum rules (FESR) for the cross section of e+e−-annihilation into hadrons are obtained within the framework of QCD. The FESR for the standard 4-quark model are in satisfactory agreement with experiment. The best description of the data is given by the 5-quark model, with the electric charge of the 5th quark Q5 = −1/3