Testing Improved Actions

Details Testing Improved Actions Testing Improved Actions

1996-07-02

arxiv.org/abs/hep-lat/9607007v1

Physics

High Energy Physics

High Energy Physics - Lattice

Contribution to the second workshop ``Continuous advances in QCD", 13 pages, latex, 2 figures

Scientific paper

We discuss testing improved actions in the context of finite volume gauge theories, where both results for the continuum and the Wilson lattice action are known analytically for volumes up to 0.7 fermi across. A new improved action is introduced, obtained by adding a 2 x 2 plaquette to the L\"uscher-Weisz Symanzik action, for which the gauge field propagator greatly simplifies. We call this the square Symanzik action. We present the tree-level parameters of this improved action and the value of its Lambda parameter. We also give some Monte Carlo results and discuss some of the issues related to violations of unitarity at the scale of the lattice cutoff due to next-to-nearest coupling in the time direction.

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