Improved lattice actions for Kogut-Susskind quarks have been shown to improve rotational symmetry and flavor symmetry. In this work we find improved scaling behavior of the rho and nucleon masses expressed in units of a length scale obtained from the static quark potential, and better behavior of the Dirac operator in instanton backgrounds.
@article{arxiv.hep-lat/9912018,
title = {Scaling tests of the improved Kogut-Susskind quark action},
author = {The MILC collaboration and C. Bernard and T. Burch and T. A. DeGrand and C. E. DeTar and S. Gottlieb and U. M. Heller and J. Hetrick and K. Orginos and R. L. Sugar and D. Toussaint},
journal= {arXiv preprint arXiv:hep-lat/9912018},
year = {2008}
}