POSSIBLE EFFECTS OF QUARK AND GLUON CONDENSATES IN HEAVY QUARKONIUM SPECTRA

The Cornell potential with the best fitted parameters alpha(s) and kap pa are modified by adding terms derived from nouperturbative QCD, whic h are characterized by a series of nonvanishing vacuum condensates of quarks and gluons. In terms of this potential, we study the system of heavy quarkonia. The results show that the correction caused by the ad ditional terms reduces the deviation between the data and the values c alculated with the pure Cornell potential and improves the splittings of energy levels. The achievements indicate that the nonperturbative e ffects induced by vacuum condensates play an important role for the co rrection to 1/q(2), which in general was phenomenologically put in by hand. This result would be helpful for understanding nonperturbative Q CD along a parallel direction to the QCD sum rules.