We made an extensive study of the light hadron spectrum using the Wilson gauge action and Kogut-Susskind quarks. Using both dynamical quarks and the quenched approximation, we determine hadron masses for five and four gauge couplings respectively, with at least five quark masses at each coupling. In the continuum limit, we find a significant difference between two flavors of dynamical quarks and the quenched approximation for a range of quark masses.
@article{arxiv.hep-lat/9810035,
title = {Light hadron spectrum with Kogut-Susskind quarks},
author = {MILC Collaboration and C. Bernard and C. DeTar and Steven Gottlieb and Urs M. Heller and J. E. Hetrick and C. McNeile and K. Rummukainen and R. Sugar and D. Toussaint},
journal= {arXiv preprint arXiv:hep-lat/9810035},
year = {2008}
}