Light Hadron Spectroscopy on Coarse Lattices with O(a^2) Mean-Field Improved Actions

Details Light Hadron Spectroscopy on Coarse Lattices with O(a^2) Mean-Field Improved Actions Light Hadron Spectroscopy on Coarse Lattices with O(a^2) Mean-Field Improved Actions

1997-11-20

arxiv.org/abs/hep-lat/9711044v1

Phys.Rev.D59:074504,1999

Physics

High Energy Physics

High Energy Physics - Lattice

17 page RevTeX manuscript. 7 Figures. This and related papers may also be obtained from http://www.physics.adelaide.edu.au/~

Scientific paper

10.1103/PhysRevD.59.074504

The masses and dispersions of light hadrons are calculated in lattice QCD using an O(a^2) tadpole-improved gluon action and an O(a^2) tadpole-improved next-nearest-neighbor fermion action originally proposed by Hamber and Wu. Two lattices of constant volume with lattice spacings of approximately 0.40 fm and 0.24 fm are considered. The results reveal some scaling violations at the coarser lattice spacing on the order of 5%. At the finer lattice spacing, the calculated mass ratios reproduce state-of-the-art results using unimproved actions. Good dispersion and rotational invariance up to momenta of pa ~ 1 are also found. The relative merit of alternative choices for improvement operators is assessed through close comparisons with other plaquette-based tadpole-improved actions.

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