Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1997-09-26
Nucl.Phys.Proc.Suppl.63:862-864,1998
Physics
High Energy Physics
High Energy Physics - Lattice
3 pages, LaTeX, uses espcrc2, Contribution to LATTICE 97
Scientific paper
10.1016/S0920-5632(97)00922-5
We investigate a tadpole-improved tree-level-O(a^3)-accurate action, D234c, on coarse lattices, using the mean link in Landau gauge to measure the tadpole contribution. We find that D234c shows much better rotational invariance than Sheikholeslami-Wohlert, and that mean-link tadpole improvement gives much better hadron mass scaling than plaquette tadpole improvement, with finite-a errors at 0.25 fm of only a few percent. We explore the effects of possible O(alpha_s) changes to the improvement coefficients, and find that the two leading coefficients can be independently tuned: hadron masses are only sensitive to the clover coefficient, while hadron dispersion relations are only sensitive to the third derivative coefficient. Preliminary non-perturbative tuning of these coefficients yields values that are consistent with the expected size of perturbative corrections.
Alford Mark
Klassen Timothy R.
Lepage Peter
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