A near Threshold J/ψ Photo-production Measurement in Hall C at Jefferson Lab*

J/ψ photoproduction near threshold provides a unique window into the non-perturbative structure of the gluonic fields of the nucleon, enabling access to information regarding the origin of its mass and mass radius. In the Jefferson Lab E12-16-007 experiment, we measured the two-dimensional J/ψ photoproduction cross-section as a function of photon energy E_γ and momentum transfer t near-threshold. The E12-16-007 experiment was conducted in the experimental Hall C using a high-intensity bremsstrahlung photon beam generated by a 10.6 GeV incident electron beam traversing a copper radiator upstream of a liquid hydrogen target. We will present the results of our measurement of the two-dimensional J/ψ photoproduction cross-section in photon energy E_γ and t, and their impact on our knowledge of the proton mass radius and the relative quantum anomalous energy contribution to its mass.