Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1996-11-22
Physics
High Energy Physics
High Energy Physics - Lattice
LaTex 8 pages, 3 figures, uses sprocl.sty (included). To appear in the proceedings of the conference ``Multi-Scale Phenomena a
Scientific paper
The improved Wilson quark action - the clover action - is constructed to have smaller discretization errors than the normal Wilson quark action. We test this in a quenched spectroscopy computation on 6 lattice ensembles with spacings from 0.15 to 0.43 fm. To ensure that the dominant scaling violations come from the fermions we use an $O(a^2)$ improved 6-link $SU(3)$ pure gauge action. We find evidence that fermionic scaling violations are consistent with $O(a^2)$ for clover fermions and $O(a)$ with a nonnegligible $O(a^2)$ term for standard Wilson fermions. This latter mixed ansatz makes a reliable continuum extrapolation problematic for Wilson fermions. For clover fermions, on the other hand, we obtain accurate predictions for hadron masses in quenched continuum QCD. We find that the slopes of the scaling violations are roughly 200 MeV for both Wilson and clover fermions.
Collins Sara
Edwards Robert G.
Heller Urs M.
Sloan J. J.
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