Generalized parton distributions and transverse densities in a light-front quark-diquark model for the nucleons

TL;DR

This paper investigates the generalized parton distributions of protons using a light-front quark-diquark model derived from AdS/QCD, revealing diffraction patterns and providing insights into nucleon structure in momentum and position spaces.

Contribution

It introduces a novel application of the soft-wall AdS/QCD model to compute GPDs in a light-front quark-diquark framework, including nonzero skewness and transverse densities.

Findings

GPDs exhibit diffraction patterns in longitudinal position space.

Comparison with other models shows consistent features of nucleon structure.

Flavor decompositions of form factors and densities are provided.

Abstract

We present a study of the generalized parton distributions for the quarks in a proton in both momentum and position spaces using the light-front wave functions of a quark-diquark model for the nucleon predicted by the soft-wall model of AdS/QCD. The results are compared with the soft-wall AdS/QCD model of proton GPDs for zero skewness. We also calculate the GPDs for nonzero skewness. We observe that the GPDs have a diffraction pattern in longitudinal position space, as seen before in other models. Then we present a comparitive study of the nucleon charge and anomalous magnetization densities in the transverse plane. Flavor decompositions of the form factors and transverse densities are also discussed.