QCD vacuum condensates and parameterized quark propagator

Based on the Global Color Symmetry Model, the non-perturbative QCD vacuum is investigated by use of the parameterized fully dressed quark propagator. Our theoretical predictions for various quantities characterized the QCD vacuum are in agreement with those predicted by many other phenomenological QCD inspired models. The successful predictions clearly indicate the extensive validity of our parameterized quark propagator. A detailed discussion on the arbitrariness in determining the integration cut-off parameter of μ2 in calculating QCD vacuum condensates is given and a good method, which avoids the dependence of calculating results on the cut-off parameter, is also strongly recommended. (authors)