Abstract
We develop a quantum-mechanical treatment of color transparency effects indiffractive photoproduction of c-pairs on nuclei using the path-integral method. The evolution of the c wave function during propagation through a nucleus is rather a considerable distortion of its form, than a trivial attenuation. One of the manifestations of the quantum effects is a nuclear antishadowing of Ψ′ yield, i.e. transparency above one. On the contrary a considerable nuclear shadowing is predicted for the photoproduction of J/Ψ, in spite of its smaller absorption cross section.
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