On the gluon shadowing effect in light and heavy nuclei at small x

2025/05/03 by A. V. Lipatov, Lipatov, A. V., G. I. Lykasov +3
Physics and Astronomy · #Particle physics theoretical and experimental studies #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2505.01770

Abstract

We propose new Transverse Momentum Dependent (TMD) gluon densities in nuclei. Our method is based on a combination of the color dipole scattering formalism, within which we interpret the nuclear deep inelastic structure functions F₂^A(x, Q²) and well established property of geometrical scaling from nucleons to nuclei. As an input, we employ the TMD gluon density in a proton which provides a self-consistent simultaneous description of the numerous HERA and LHC data on pp, ep and γp processes. After fitting the relevant phenomenological parameters to the experimental data on the ratios F₂^A(x, Q²)/F₂^{A^′}(x, Q²) for several nuclear targets A and A^′, we derive the corresponding nuclear gluon distributions. Then, we make predictions for gluon shadowing effects at small Bjorken x in their dependence of the mass number A. A comparison with other approaches is given.

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