Mean-link tadpole improvement of SW and D234 actions
| Autor: | Mark G. Alford, Peter Lepage, T.R. Klassen |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Physics
Nuclear and High Energy Physics Particle physics High Energy Physics::Lattice High Energy Physics - Lattice (hep-lat) Hadron FOS: Physical sciences Gauge (firearms) Tadpole (physics) Third derivative Measure (mathematics) Atomic and Molecular Physics and Optics Action (physics) High Energy Physics - Lattice Dispersion relation Rotational invariance |
| Zdroj: | Nuclear Physics B - Proceedings Supplements. 63:862-864 |
| ISSN: | 0920-5632 |
| DOI: | 10.1016/s0920-5632(97)00922-5 |
| Popis: | 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. Comment: 3 pages, LaTeX, uses espcrc2, Contribution to LATTICE 97 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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