  Non-perturbative QCD mechanisms are of fundamental importance in strong
interaction physics. In particular, the flavor singlet axial anomaly leads to a
gluonic pole mechanism which has been shown to explain the $\eta^{\prime}$
mass, violations of the OZI rule and more recently the proton spin. We show
here that the interaction derived from the gluonic pole exchange explains the
high momentum transfer behavior of the photoproduction cross sections of vector
mesons at JLab energies.
