Diffraction and the gluon mass

We recently proposed a QCD Pomeron described by the exchange of two nonperturbative gluons characterized by a dynamically generated gluon mass. It is shown here that data on elastic scattering, exclusive $\rho$ production in deep inelastic scattering, and the $\frac{J}{\psi }$-nucleon total cross section can be successfully described in terms of a single gluon mass $m_g\simeq 0.37$ GeV. We observe that the total cross sections of hadrons with small radii, such as $\frac{J}{\psi }$, have a marked dependence on the effective gluon mass.