We have been studying effects of dynamical quarks on various hadronic observables, using our recently formulated improvement for staggered fermions. To illustrate improvement, we show that the light hadron spectrum in the quenched approximation gives remarkably good scaling. We highlight three new results: (1) We find no apparent quark loop effects in the Edinburgh plot with 2+1 flavors of dynamical quarks at a = 0.14 fm. (2) We show that dynamical quarks modify the shape of the heavy quark potential. (3) We present results hinting at meson decay effects in light hadron spectroscopy.
@article{arxiv.hep-lat/0010065,
title = {Quark Loop Effects with an Improved Staggered Action},
author = {MILC Collaboration and C. Bernard and T. Burch and T. A. DeGrand and C. E. DeTar and Steven Gottlieb and U. M. Heller and K. Orginos and R. L. Sugar and D. Toussaint},
journal= {arXiv preprint arXiv:hep-lat/0010065},
year = {2008}
}