Universality of Generalized Parton Distributions in Light-Front Holographic QCD

TL;DR

This paper demonstrates that generalized parton distributions can be universally described using light-front holographic QCD with a single reparametrization function, linking Regge behavior, inclusive rules, and hadron spectra.

Contribution

It introduces a universal reparametrization function in light-front holographic QCD that accurately models parton distributions for nucleons and pions, connecting Regge theory and the Veneziano model.

Findings

Accurate descriptions of nucleon and pion quark distributions.

A single-parameter ansatz for the reparametrization function.

Connection established between GPDs, Regge theory, and the Veneziano model.

Abstract

The structure of generalized parton distributions is determined from light-front holographic QCD up to a universal reparametrization function $w(x)$ which incorporates Regge behavior at small $x$ and inclusive counting rules at $x \to 1$. A simple ansatz for $w(x)$ which fulfills these physics constraints with a single-parameter results in precise descriptions of both the nucleon and the pion quark distribution functions in comparison with global fits. The analytic structure of the amplitudes leads to a connection with the Veneziano model and hence to a nontrivial connection with Regge theory and the hadron spectrum.