Proton helicity structure function g_1^p from a holographic Pomeron

TL;DR

This paper uses a holographic dual model to analyze the proton's spin structure function g_1^p, comparing it with experimental data and QCD predictions, especially at small Bjorken x relevant for future Electron-Ion Collider experiments.

Contribution

It introduces a holographic Pomeron model to predict g_1^p at small x, providing a novel non-perturbative approach and contrasting it with standard QCD extrapolations.

Findings

Holographic model predicts positive g_1^p at very small x.

Significant differences between holographic and perturbative QCD predictions.

Model aligns with existing data at higher momentum fractions.

Abstract

We present a detailed analysis of the polarized and the unpolarized deep inelastic scattering structure functions of the proton, g_1^p and F_2^p respectively, in the context of a holographic dual description based on type IIB superstring theory. We compare this description with experimental data and Quantum Chromodynamics estimates computed at leading, next-to-leading and next-to-next-to-leading order in perturbation. We confront the predictions of a holographic dual model and those of perturbative QCD for g_1^p at the kinematics that will be probed by the forthcoming Electron-Ion Collider. We find that the extrapolation of g_1^p to very small values the Bjorken variable computed with a Holographic Pomeron model based on actual data at higher momentum fractions is always positive and differs significantly with standard projections based on perturbative QCD.