Flavor-Symmetry Restoration and Symanzik Improvement for Staggered Quarks

Details Flavor-Symmetry Restoration and Symanzik Improvement for Staggered Quarks Flavor-Symmetry Restoration and Symanzik Improvement for Staggered Quarks

1998-09-21

arxiv.org/abs/hep-lat/9809157v1

Phys.Rev. D59 (1999) 074502

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages

Scientific paper

10.1103/PhysRevD.59.074502

We resolve contradictions in the literature concerning the origins and size of unphysical flavor-changing strong interactions generated by the staggered-quark discretization of QCD. We show that the leading contributions are tree-level in $\order(a^2)$ and that they can be removed by adding three correction terms to the link operator in the standard action. These corrections are part of the systematic Symanzik improvement of the staggered-quark action. We present a new improved action for staggered quarks that is accurate up to errors of $\order(a^4,a^2\alpha_s)$ --- more accurate than most, if not all, other discretizations of light-quark dynamics.

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