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We study the reactions $\gamma^*(Q^2)p\to\rho^0 p$ and$\gamma^*(Q^2)p\to\gamma^*(Q^2) p$ at large Q^2 and $W^2/Q^2$ and smallmomentum transfer, $\kappa^2_\perp$, to the nucleon where the pomeron exchangedominates. At large Q^2 the virtual photon selects a hard $q\bar q$ pair, thusselecting the hard pomeron component (the BFKL pomeron). The amplitudes forboth transverse and longitudinal polarizations of the initial photon andoutgoing $\rho$-meson (photon) are calculated in the framework of the BFKLpomeron exchange. Our calculations show that one cannot expect the early onsetof the pure perturbative regime in the discussed diffractive processes: thesmall interquark distances, $\rho_{q\bar q} <0.2$ fm, start to dominate notearlier than at $Q^2 \simeq 100 GeV^2, W^2/Q^2 \simeq 10^7$ in$\gamma^*(Q^2)p\to\rho^0 p$ and $Q^2 \simeq 50 GeV^2, W^2/Q^2 \simeq 10^6$ in$\gamma^*(Q^2)p\to\gamma^*(Q^2) p$.Comment: 20 pages, LaTeX, epsfig.st

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Pomeron in diffractive processesγ*(Q2)p→