Gravitational form factors and mechanical properties of proton in a light-front quark-diquark model

TL;DR

This paper calculates gravitational form factors of the proton using a light-front quark-diquark model based on soft-wall AdS/QCD, revealing insights into the proton's internal mechanical properties and consistency with lattice QCD and experimental data.

Contribution

It introduces a novel application of a light-front quark-diquark model with soft-wall AdS/QCD to compute GFFs and mechanical properties of the proton, aligning with lattice and experimental results.

Findings

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

The $D$-term form factor matches experimental and lattice data

Pressure and shear force distributions are consistent with other models

Abstract

We obtain the gravitational form factors (GFFs) and investigate their applications for the description of the mechanical properties, i.e., the distributions of pressures, shear forces inside proton, and the mechanical radius, in a light-front quark-diquark model constructed by the soft-wall AdS/QCD. 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. The pressure and shear force distributions are also consistent with the results of different models.