The Effectiveness of Non-Perturbative O(a) Improvement in Lattice QCD

Abstract

The ALPHA collaboration has determined the O(a) improved Wilson quark action for lattice spacings $a\le 0.1$ fm, in the quenched approximation. We extend this result to coarser lattices, $a\le 0.17$ 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%.

Comments: 4 pages, REVTeX, 4 ps figure files (some rewordings, references updated, to appear in Phys. Rev. Lett.)