Glauber - Gribov approach for DIS on nuclei in N=4 SYM

TL;DR

This paper develops a Glauber-Gribov approach for deep-inelastic scattering on nuclei within N=4 SYM, revealing properties similar to high density QCD and proposing a new formalism for shock wave interactions.

Contribution

It introduces a novel application of the Glauber-Gribov approach in N=4 SYM and proposes a renormalized Lagrangian for the shock wave formalism that aligns with this approach.

Findings

Amplitude exhibits geometrical scaling similar to high density QCD.

Quantum effects induce an imaginary part in the nucleon amplitude.

Saturation momentum is energy-independent, consistent with prior studies.

Abstract

In this paper the Glauber-Gribov approach for deep-inelastic scattering (DIS) with nuclei is developed in N=4 SYM. It is shown that the amplitude displays the same general properties, such as geometrical scaling, as is the case in the high density QCD approach. We found that the quantum effects leading to the graviton reggeization, give rise to an imaginary part of the nucleon amplitude, which makes the DIS in N=4 SYM almost identical to the one expected in high density QCD. We concluded that the impact parameter dependence of the nucleon amplitude is very essential for N=4 SYM, and the entire kinematic region can be divided into three regions which are discussed in the paper. We revisited the dipole description for DIS and proposed a new renormalized Lagrangian for the shock wave formalism which reproduces the Glauber-Gribov approach in a certain kinematic region. However the saturation momentum turns out to be independent of energy, as it has been discussed by Albacete, Kovchegov and Taliotis. We discuss the physical meaning of such a saturation momentum $Q_s(A)$ and argue that one can consider only $Q>Q_s(A)$ within the shock wave approximation.