Perturbative Color Transparency in Electron Beam Experiments via Impact-parameter Factorization

Color transparency is an important tool to investigate exclusive processes using nuclear targets. The earliest predictions of the phenomenon, going back to 1982, were based on having asymptotically large Q select short distance. Given the difficulties over short-distance dominance, the transition to color transparency then multiplied the controversy. However the discovery of nuclear filtering shifted the emphasis. Components of a hadronic quark wave function with large transverse spatial separations cannot propagate elastically in nuclear matter. This fact of QCD, noted earlier 5 for diffractive processes, was re-discovered for color transparency. It was realized that asymptotically large Q is unnecessary to motivate perturbative color transparency.