Abstract
In this paper we attempt to find, within the framework of perturbative QCD, an improved description of the small-x region of deep-inelastic scattering. Motivated by results on the Pomeron in QCD, we investigate diagrams with a system of an arbitrary number of ghion lines in thet-channel. The gluon lines are allowed to interact pairwise in all possible combinations. We find that the leading behaviour of these diagrams comes from configurations where the gluon lines arrange themselves into non interacting, non-forward ladders. We then analyse couplings between gluon ladders, in particular non-planar ones. We compare our results with a previous study of Gribov, Levin, and Ryskin. In agreement, with them we conclude that the sum of these diagrams leads to a tempered increase of the structure function in the small-x region.
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