Nonperturbative propagators in quantum chromodynamics

Leading nonperturbative corrections to the quark and gluon propagators are derived following the assumption that the nonperturbative QCD vacuum can be described in terms of nonvanishing vac- uum expectation values for the composite operators [ψ¯ψ] and [$G_{\mu \nu }$ ${\mathrm{}}^2$]. The nonperturbative quark propagator can be described in terms of a running gauge-dependent quark mass and a running normalization function. The nonperturbative gluon propagator can be described in terms of a running gauge parameter and a running normalization function.