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We extend a previous improved action study of the Landau gauge gluon propagator, by using a variety of lattices with spacings from a=0. 17 to 0. 41 fm, to more fully explore finite volume and discretization effects. We also extend a previously used technique for minimizing lattice artifacts, the appropriate choice of momentum variable or ``kinematic correction, '' by considering it more generally as a ``tree-level correction. '' We demonstrate that by using tree-level correction, determined by the tree-level behavior of the action being considered, it is possible to obtain scaling behavior over a very wide range of momenta and lattice spacings. This makes it possible to explore the infinite volume and continuum limits of the Landau-gauge gluon propagator.
Bonnet et al. (Thu,) studied this question.