  In the non-perturbative regime the usual gauge fixing is not sufficient due
to the Gribov problem. To deal with it one can restrict the integration in the
path integral to the first Gribov region by using the Gribov-Zwanziger action.
In its local form it features additional auxiliary fields which mix with the
gluon at the two-point level. We present an explicit infrared analysis of this
action. We show that from the two possible scaling solutions obtained
previously only one remains: It coincides exactly with the results from the
Faddeev-Popov action, i.e., the ghost propagator is infrared enhanced and the
gluon propagator infrared suppressed and the corresponding power law behavior
is described by only one parameter kappa=0.5953. This corroborates the argument
by Zwanziger that for functional equations it suffices to take into account the
appropriate boundary conditions and no explicit restriction in the path
integral measure is required.
