Speaker
Description
I shall describe the most recent results of the J/$\psi$-007 experiment in Hall C at Jefferson Lab. The doubly differential cross section, both in photon energy $(E_{\gamma}$ and momentum transfer ($t$), for the near-threshold photoproduction of J/$\psi$ on the nucleon through its J/$\psi$ muon-decay channel, is compared to all available electron-decay channel data from Jefferson Lab, namely GlueX, CLAS12, J/$\psi$-007. Using those data together, I will show their impact on the extraction of the gluon gravitational form factors (GFFs) $A_g(t)$ and $C_g(t)$ using the QCD holographic model among others, and compare the results to lattice QCD. Furthermore, these EMT form factors are combined with the lattice EMT quark form factors $A_a(t)$ and $C_q(t)$ to evaluate the scalar and mass GFFs. The resulting scalar and mass energy density distribution in different frames, Breit and Drell-Yan frames will be shown. I will then discuss a resulting consequence, a comparison of the strong interaction size versus the electromagnetic size of the proton. I'll conclude my presentation with the impact of future detectors on those quantities, SoLID at Jefferson Lab for the J/$\psi$ near threshold production and ePIC at BNL for the $\Upsilon$ near threshold production at the EIC.