Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1998-10-28
Nucl.Phys. B547 (1999) 259-280
Physics
High Energy Physics
High Energy Physics - Lattice
29 pages, LaTeX with 24 eps figures; Due to the suggestion of a referee, the previous version of this paper has been merged wi
Scientific paper
We study exceptional modes of both the Wilson and the clover action in order to understand why quenched clover spectroscopy suffers so severely from exceptional configurations. We show that, in contrast to the case of the Wilson action, a large clover coefficient can make the exceptional modes extremely localized and thus very sensitive to short distance fluctuations. We describe a way to optimize the chiral behavior of Wilson-type lattice fermion actions by studying their low energy real eigenmodes. We find a candidate action, the clover action with fat links with a tuned clover term. We present a calculation of spectroscopy and matrix elements at Wilson gauge coupling beta=5.7. When compared to simulations with the standard (nonperturbatively improved) clover action at small lattice spacing, the action shows good scaling behavior, with an apparent great reduction in the number of exceptional configurations.
DeGrand Thomas
Hasenfratz Anna
Kovacs Tamas G.
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