| We study the energy dependence of the saturation momentum in the context of Leading, and collinearly improved Leading and Next to Leading BFKL evolution. Considering dipole-hadron scattering, an absorptive boundary is used to describe the saturation effects that limit the region of linear dynamics. At the Next to Leading Level we find that the logarithmic derivative of the saturation momentum is varying very slowly with Bjorken-x. Its value is found to be stable and in very good agreement with the successful model of Golec-Biernat and Wüsthoff. The scaling form of the amplitude in the perturbative side of the boundary is given and it is independent of the particular dynamics considered. In the fixed coupling case it is an exact and, presumably, the unique scaling solution of the BFKL equation in the presence of saturation. |
