The static quark potential in three flavor QCD
  We study the effects of dynamical quarks on the static quark potential at distances shorter than those where string breaking is expected. Quenched calculations and calculations with three flavors of dynamical quarks are done on sets of lattices with the lattice spacings matched within about one percent. The effect of the sea quarks on the shape of the potential is clearly visible. We investigate the consequences of these effects in a very crude model, namely solving Schroedinger's equation in the resulting potential. 
C. Bernard, T. Burch, K. Orginos, D. Toussaint, T.A. DeGrand, C.E.   DeTar, S. Gottlieb, U.M. Heller, J.E. Hetrick and R.L. ...