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arXiv · 2405.19981

Color dipole cross-section from unifying the color dipole picture and improved saturation models

G. R. Boroun
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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$\ddot{\mathrm{u}}$sthoff (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. The transition between these regions occurs with decreasing transverse sizes with a decrease of Bjorken $x$ and dependence on the expansion point.

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G. R. Boroun. 2024-05-30. Color dipole cross-section from unifying the color dipole picture and improved saturation models. https://doi.org/10.1088/1572-9494%2Fad9c46

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