DIS data and the problem of saturation in small-x physics

Abstract

New experimental data from HERA explore the region of very small x and small and moderate $Q^2$. We study the role of unitarity corrections in the description of these data. For that, we propose a model separating the small and large components of the $q\bar{q}$ fluctuation. This model gives a unified description of total and diffractive production in ${\gamma }^{\ast }p$ interactions. In this model unitarity corrections are controlled by diffraction data.

Comments: 4 pages, 3 postscript figures. Contributed to 36th Rencontres de Moriond on QCD and Hadronic Interactions, Les Arcs, France, 17-24 Mar 2001