Heavy Quark Anti-Quark Free Energy and the Renormalized Polyakov Loop
  We calculate the colour averaged and colour singlet free energies of static quark anti-quark sources placed in a thermal gluonic heat bath. We discuss the renormalization of these free energies using the short distance properties of the zero temperature heavy quark potential. This leads to the definition of the renormalized Polyakov loop as an order parameter for the deconfinement phase transition of the SU(3) gauge theory which is well behaved in the continuum limit. 
O. Kaczmarek, F. Karsch, P. Petreczky, F. Zantow