Abstract
Abstract We present an analysis of the color-dipole picture (CDP) for determination of the gluon
density at low-x which is obtained from the Altarelli-Martinelli equation by expansion at distinct
points of expansion. The dipole cross-sections with respect to the improved saturation model
of Bartels-Golec-Biernat-Kowalski (BGK) are obtained in a wide range of transverse sizes r and
compared with the Golec-Biernat-W¨usthoff (GBW) model. We find that the model gives a good
description of the dipole cross-section at large r which confirms saturation and matches the perturbative QCD result at a small r due to the significant role of the running of the gluon distribution.
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