Diffractive deep inelastic scattering in an AdS/CFT inspired model: A phenomenological study

TL;DR

This paper explores a nonperturbative AdS/CFT inspired model for diffractive deep inelastic scattering, comparing its predictions with perturbative approaches and experimental data, revealing limitations in describing current HERA measurements.

Contribution

It extends the AdS/CFT inspired model to diffractive processes and evaluates its effectiveness against experimental data and perturbative models.

Findings

The AdS/CFT inspired model does not fit current $F_2^{D(3)}$ HERA data.

The model predicts similar behavior to the BK equation in certain $x_{IP}$ ranges.

At very small $x_{IP}$, the diffractive structure function becomes energy independent.

Abstract

The analytical treatment of the nonperturbative QCD dynamics is one of main open questions of the strong interactions. Currently, it is only possible to get some qualitative information about this regime considering other QCD-like theories, as for example the N=4 super Yang-Mills (SYM), where one can perform calculations in the nonperturbative limit of large 't Hooft coupling using the Anti-de Sitter space/Conformal field theory (AdS/CFT). Recently, the high energy scattering amplitude was calculated in the AdS/CFT approach, applied to deep inelastic scattering (DIS) and confronted with the $F_2$ HERA data. In this work we extend the nonperturbative AdS/CFT inspired model for diffractive processes and compare its predictions with a perturbative approach based on the Balitsky - Kovchegov (BK) equation. We demonstrate that the AdS/CFT inspired model is not able to describe the current $F_2^{D(3)}$ HERA data and predicts a similar behavior to that from BK equation in the range $10^{-7} \lesssim x_{IP} \lesssim 10^{-4}$. At smaller values of $x_{IP}$ the diffractive structure function is predicted to be energy independent.