Abstract
The infrared behaviour of QCD in the Landau gauge is studied in 24 4 and 32 4 lattices by measuring the Kugo-Ojima parameter, gluon propagator, ghost propagator and the QCD running coupling. The Kugo-Ojima parameter c remains about 0.8 instead of the expectation value 1. We observe infrared suppression of the singularity of the gluon propagator and enhancement of the ghost propagator but the shifts are smaller than those of Dyson-Schwinger approach. The momentum dependence of the running coupling in the infrared region is weak and α s(0) ≅ 1.
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