We establish a relation between the two-point field strength correlator in
QCD and the dual field propagator of an effective dual Abelian Higgs model
describing the infrared behaviour of QCD. We find an analytic approximation to
the dual field propagator without sources and in presence of quark sources. In
the latter situation we also obtain an expression for the static qqˉ​
potential. Our derivation sheds some light on the dominance and
phenomenological relevance of the two-point field strength correlator.Comment: 28 pages, 1 figure, RevTe