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

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

1997-11-27

arxiv.org/abs/hep-lat/9711052v2

Phys.Rev.Lett. 80 (1998) 3448-3451

Physics

High Energy Physics

High Energy Physics - Lattice

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

Scientific paper

10.1103/PhysRevLett.80.3448

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