The Effectiveness of Non-Perturbative O(a) Improvement in Lattice QCD
R. G. Edwards, U. M. Heller, T. R. Klassen
Abstract
The ALPHA collaboration has determined the O(a) improved Wilson quark action for lattice spacings a≤ 0.1 fm, in the quenched approximation. We extend this result to coarser lattices, a≤ 0.17 fm, and calculate the hadron spectrum on them. The large range of lattice spacings obtained by combining our results with earlier ones on finer lattices, allow us to present a convincing demonstration of the efficiency of non-perturbative O(a) improvement. We find that scaling violations of the hadron masses studied drop from 30-40% for the unimproved Wilson action on the coarsest lattice to only 2-3%.
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