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So far, the infrared behavior of the gluon and ghost propagator based on theGribov-Zwanziger approach predicted a positivity violating gluon propagatorvanishing at zero momentum, and an infrared enhanced ghost propagator. However,recent data based on huge lattices have revealed a positivity violating gluonpropagator which turns out to attain a finite nonvanishing value very close tozero momentum. At the same time the ghost propagator does not seem to beinfrared enhanced anymore. We point out that these new features can beaccounted for by yet unexploited dynamical effects within the Gribov-Zwanzigerapproach, leading to an infrared behavior in qualitatively good agreement withthe new data.

New features of the gluon and ghost propagator in the infrared region from the Gribov-Zwanziger approach