  We report on a study of the analytical structure of the Landau gauge gluon,
ghost and quark propagators taken from lattice simulations using large physical
volumes, to better access the IR region, and large gauge ensembles to reduce
the statistical uncertainties. The investigation uses Pad\'e approximants to
look at poles and branch cuts for each of the propagators. For the gluon
propagator we identify complex conjugate poles and a branch point. For the
ghost propagator the procedure identifies a pole at zero momentum and a branch
point for Minkowski-like momenta. The quark propagator appears to have a pole
for Minkowski-like momenta that is correlated with the pion mass as expected
from PCAC.
