From color glass to color dipoles in high-energy onium-onium scattering

Within the Color Glass formalism, we construct the wavefunction of a high energy onium in the BFKL and large-N-C approximations, and demonstrate the equivalence with the corresponding result in the Color Dipole picture. We propose a simple factorization formula for the elastic scattering between two non-saturated color glasses in the center-of-mass frame. This is valid up to energies which are high enough to allow for a study of the onset of unitarization via multiple pomeron exchanges. When applied to the high energy onium-onium scattering, this formula reduces to the Glauber-like scattering between two systems of dipoles, in complete agreement with the dipole picture. (C) 2003 Elsevier B.V. All rights reserved.