Color Transparency and Color Opacity in Coherent Production of Vector Mesons off Light Nuclei at small x
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Coherent electroproduction of vector mesons off $^2$H and $^4$He is considered in the kinematics of deep inelastic scattering. Special emphasis is given to the $-t\sim 0.8-1$ GeV$^2$ region where the cross section is dominated by the interaction of the $q\bar q$ configuration in the $γ^*$ with two nucleons. These kinematics provide the unique possibilities to study quantitatively in vector meson production the onset of Color Transparency with increasing $Q^2$ as well as its gradual disappearance at very small $x$, i.e., perturbative Color Opacity.
3 pages, LaTeX, 2 Postscript figures included using epsfig.sty. To appear in the conference proceedings of the Workshop "Future Physics at HERA"
3 pages, LaTeX, 2 Postscript figures included using epsfig.sty. To appear in the conference proceedings of the Workshop "Future Physics at HERA"