Topology of full QCD
Ph. de Forcrand, M. Garcia Perez, J. E. Hetrick, I. -O. Stamatescu
Abstract
We study topological properties of SU(3) gauge theory using improved cooling. In the absence of fermions, we measure a topological susceptibility of (182(8) MeV)4 and an instanton size 0.6 fm. In the presence of light staggered fermions and across the chiral transition, the susceptibility drops in a manner consistent with the quenched case, and the instanton size changes little. No significant formation of bound instanton-antiinstanton pairs is observed, in particular not along the Euclidean time direction for T > Tc.
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