Speaker
Description
Recent advancements in both theoretical frameworks and experimental methodologies have significantly enhanced our understanding of the internal mechanical properties of nucleons, particularly the role of gluonic contributions. Central to this investigation are the gravitational form factors, which encapsulate the nucleon’s energy, momentum, pressure, and shear distributions. These form factors can be studied via first-principles calculations in lattice QCD as well as holographic QCD models, with remarkable consistency observed between the two approaches.
This talk will focus on the computation of gluonic gravitational form factors within holographic QCD, emphasizing the interplay between the $A$-term and $D$-term contributions. These form factors are shown to effectively capture the nucleon's mass distribution, pressure, and shear. Furthermore, we will discuss the recent experimental extraction of the tensor ($A$-term) and scalar ($D$-term) form factors using the holographic scattering amplitudes and data from JLab's $J/\psi-007$ experiment, particularly in the near-threshold photoproduction of $J/\psi$ on the proton. The holographic predictions not only align well with lattice QCD results but also provide deeper insights into the gluonic mass radius and the nucleonic pressure and shear profiles. These findings underscore the profound connections between holographic duality and non-perturbative QCD dynamics, contributing to our understanding of the quantum origins of visible mass in the universe.
By highlighting these theoretical developments and their experimental validation, this talk aims to illuminate the potential of holographic approaches in advancing QCD phenomenology.
