Proton gravitational form factors in a light-front quark-diquark model

TL;DR

This paper calculates the gravitational form factors of the proton using a light-front quark-diquark model based on soft-wall AdS/QCD, providing insights into internal pressure and shear distributions consistent with lattice QCD and experimental data.

Contribution

The study introduces a novel calculation of all four proton gravitational form factors within a light-front quark-diquark model derived from soft-wall AdS/QCD, including pressure and shear distributions.

Findings

GFFs A(Q^2) and B(Q^2) agree with lattice QCD results.

D-term form factor behavior matches DVCS and lattice data.

Pressure and shear distributions inside the proton are characterized.

Abstract

We present a recent calculation of the gravitational form factors (GFFs) of proton using the light-front quark-diquark model constructed by the soft-wall AdS/QCD. The four GFFs $~A(Q^2)$ , $B(Q^2)$ , $C(Q^2)$ and $\bar{C}(Q^2)$ are calculated in this model. We also show the pressure and shear distributions of quarks inside the proton. The GFFs, $A(Q^2)$ and $B(Q^2)$ are found to be consistent with the lattice QCD, while the qualitative behavior of the $D$-term form factor is in agreement with the extracted data from the deeply virtual Compton scattering (DVCS) experiments at JLab, the lattice QCD, and the predictions of different phenomenological models.