Evidence for color fluctuations in the nucleon in high-energy scattering
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We study quantum fluctuations of the nucleon's parton densities by combining QCD factorization for hard processes with the notion of cross section fluctuations in soft diffraction. The fluctuations of the small-x gluon density are related to the ratio of inelastic and elastic vector meson production in e-p scattering. A simple dynamical model explains the HERA data and predicts the x- and Q^2-dependence of the ratio. In p-p/pbar-p scattering, fluctuations enhance multiple hard processes (but cannot explain the Tevatron CDF data), and reduce gap survival in central exclusive diffraction.
4 pages, 3 figures
4 pages, 3 figures