Contributions of gluon recombination to saturation phenomena

Details Contributions of gluon recombination to saturation phenomena Contributions of gluon recombination to saturation phenomena

2003-08-31

arxiv.org/abs/hep-ph/0309003v1

Phys.Rev. D68 (2003) 094015

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, LATEX, 22 figures, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.68.094015

Parton distributions in the small $x$ region are numerically predicted by using a modified DGLAP equation with the GRV-like input distributions. We find that gluon recombination at twist-4 level obviously suppresses the rapid growth of parton densities with $x$ decrease. We show that before the saturation scale $Q^2_s$ is reached, saturation and partial saturation appear in the small $x$ behavior of parton distributions in nucleus and free proton, respectively. The antishadowing contributions to the saturation phenomena are also discussed.

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