Speaker
Description
We calculate the gluon gravitational form factors (GFFs) of the proton and explore their implications for the proton's mechanical properties, including pressure and shear force distributions, as well as the mechanical and mass radii, using a light-front gluon-spectator model based on soft-wall AdS/QCD. The model parameters are determined by fitting the unpolarized gluon distribution function to the NNPDF3.0nlo dataset. Subsequently, we predict the polarized gluon distribution, finding consistency with global analyses. Our predictions for the gluon GFFs, $A(Q^2)$ and $D(Q^2)$, show good agreement with recent lattice QCD simulations and experimental extractions. Using these gluon GFFs, we compute the proton’s gluonic mass and mechanical radii, finding a larger mass radius but a smaller mechanical radius compared to the proton’s charge radius, consistent with recent lattice QCD results.
