PERTURBATION-THEORY AND CONDENSATES

A convergent scheme to deal with perturbation theory in presence of infrared renormalons is presented, extending its validity to large orders and stronger coupling. An unambiguous meaning is given to the condensates appearing in the operator product expansion. The QCD sum rule approach is justified, but definite corrections are pointed out. The interesting possibility that the latter are not mere corrections, but the only actually present terms is pointed out, in which case all ''non-perturbative'' terms in the operator product expansion could be determined in principle from perturbation theory.