A STUDY OF GLUON PROPAGATOR ON COARSE LATTICE

We study gluon propagator in Landau gauge with lattice QCD, where we use an improved lattice action. The calculation of gluon propagator is performed on lattices with the lattice spacing from 0.40 fm to 0.24 fm and with the lattice volume from (2.40 fm)(4) to (4.0 fm)(4). We find that the rotation invariance is approximately restored in the q(2)-range, indicated by the fact that the propagator is a smooth function of the continuum momentum q(2). We try to fit our results by two different ways, in the first one we interpret the calculated gluon propagators as a function of the continuum momentum, while in the second we interpret the propagators as a function of the lattice momentum. In both cases we use models which are the same in continuum limit. A qualitative agreement between two fittings is found.