Nuclear shadowing in the light-cone dipole approach

TL;DR

This paper investigates nuclear shadowing at very small Bjorken x using a light-cone dipole approach, incorporating color transparency and coherence effects, and compares the results with experimental data and other models.

Contribution

It introduces a numerical solution for the Green function evolution equation to accurately calculate nuclear shadowing, including higher Fock states with gluons.

Findings

Nuclear shadowing increases at x < 0.01 due to gluon Fock states.

Numerical results agree with E665 and NMC experimental data.

Model comparisons validate the approach's effectiveness.

Abstract

We study nuclear shadowing at small Bjorken x < 0.01 in the color dipole approach. Such a light-cone quantum-chromodynamics formalism based on the Green function technique incorporates naturally color transparency and coherence length effects. The nuclear shadowing for the barq-q Fock component of the photon is calculated using exact numerical solution of the evolution equation for the Green function. At x < 0.01 we demonstrate that a contribution of higher Fock states containing gluons to overall nuclear shadowing becomes effective. Numerical results for nuclear shadowing are compared with available data from the E665 and NMC collaborations. Model calculations are finally tested with the results obtained from other models.