Seminarium Teorii Oddziaływań Elementarnych

Saturation of gluon distribution is a consequence of non-linear evolution equations of QCD. Saturation implies the existence of so called saturation momentum which is gluon density per unit rapidity per transverse area. At large energies for certain kinematical domains saturation momentum is the only scale for physical processes. As a consequence different observables exhibit so called geometrical scaling (GS). We shall give brief introduction to the physics of saturation and then discuss a number of examples of GS and its violation in different reactions.