Separating perturbative and non-perturbative contributions to the plaquette

Abstract

We try to separate the perturbative and non-perturbative contributions to the plaquette of pure SU(3) gauge theory. To do this we look at the large-n asymptotic behaviour of the perturbation series in order to estimate the contribution of the as-yet uncalculated terms in the series. We find no evidence for the previously reported #LAMBDA#"2 contribution to the gluon condensate. Attempting to determine the conventional #LAMBDA#"4 condensate gives a value #propor to#0.03(2) GeV"4, in reasonable agreement with sum rule estimates, though with very large uncertainties. (orig.)Available from TIB Hannover: RA 2999(01-166) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman