HIGH-ENERGY LIMIT IN QCD

Some perturbative approaches to the QCD description of the deep-inelas tic ep scattering at the small Bjorken variable x are reviewed. It is shown, that in the leading logarithmic approximation the gluon is regg eized and the pomeron is a compound state of two reggeized gluons. The relation between the Schrodinger equation for the compound state of s everal reggeized gluons in the multi-colour QCD and the completely int egrable Heisenberg spin model is discussed. The effective action for t he gluon-Reggeon interactions is constructed and applied to the proble m of finding next to leading corrections to the QCD pomeron.