Topological properties of full QCD at the phase transition
  We investigate the topological properties of the QCD vacuum with 4 flavours of dynamical staggered fermions at finite temperature. To calculate the topological susceptibility we use the field-theoretical method. As in the quenched case, a sharp drop is observed for the topological susceptibility across the phase transition. 
B. Alles, M. D'Elia, A. Di Giacomo, P.W. Stephenson