Nuclear shadowing in DIS at electron-ion colliders
Departamento de Física, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaiso, Chile
2 Czech Technical University in Prague, FNSPE, Břehová 7, 11519, Prague, Czech Republic
3 Institute of Experimental Physics SAS, Watsonova 47, 04001, Košice, Slovakia
Accepted: 28 May 2020
Published online: 2 June 2020
We present a revision of predictions for nuclear shadowing in deep-inelastic scattering at small Bjorken corresponding to kinematic regions accessible by the future experiments at electron-ion colliders. The nuclear shadowing is treated within the color dipole formalism based on the rigorous Green function technique. This allows incorporating naturally color transparency and coherence length effects, which are not consistently and properly included in present calculations. For the lowest Fock component of the photon, our calculations are based on an exact numerical solution of the evolution equation for the Green function. Here the magnitude of shadowing is tested using a realistic form for the nuclear density function, as well as various phenomenological models for the dipole cross section. The corresponding variation of the transverse size of the photon fluctuations is important for , on the contrary with the most of other models, which use frequently only the eikonal approximation with the “frozen” transverse size. At , we calculate within the same formalism also a shadowing correction for the higher Fock component of the photon containing gluons. The corresponding magnitudes of gluon shadowing correction are compared adopting different phenomenological dipole models. Our results are tested by available data from the E665 and NMC collaborations. Finally, the magnitude of nuclear shadowing is predicted for various kinematic regions that should be scanned by the future experiments at electron-ion colliders.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020