  The Refined Gribov-Zwanziger (RGZ) action in the Landau gauge provides a
local and renormalizable framework to account for the existence of
infinitesimal Gribov copies in the path integral together with other relevant
infrared effects such as the formation of condensates. The properties of the
tree-level gluon propagator obtained in this setup has been thoroughly
investigated over the past decade. It accommodates important properties seen in
lattice simulations such as a finite value at vanishing momentum and positivity
violation. Yet a comprehensive study about the stability of such properties
against quantum corrections was lacking. In this work, we compute the gluon
propagator in the RGZ scenario at one-loop order and implement an appropriate
renormalization scheme in order to compare our findings with lattice data.
Remarkably, the qualitative properties of the tree-level gluon propagator are
preserved. In particular, the fits with lattice data show evidence for
positivity violation and the existence of complex poles for SU(2) and SU(3)
gauge groups. We comment on the results for the ghost propagator as well.
