Speaker
Description
Measurement of near threshold quarkonia photoproduction cross section provides a unique tool to probe gluonic structure inside the nucleon, hence allowing extraction of gluonic form factors and mass radii. 𝐽/Ψ-007 experiment (E12-16-007) was conducted at Hall-C of the Thomas Jefferson National Accelerator Facility to measure near threshold 2-D differential 𝐽/Ψ photoproduction cross section as a function of photon energy 𝐸𝛾 and Mandelstam variable 𝑡 (momentum transfer from initial photon to the produced 𝐽/Ψ). The experiment utilized a high intensity real photon beam produced by incidence of a 10.6 GeV incident electron beam on a copper radiator situated upstream of a hydrogen target. The produced e−e+ (𝜇−𝜇+) pair from decay of 𝐽/Ψ was detected using two arm spectrometers in Hall C: the HMS and the SHMS. The scanned photon energy range 𝐸𝛾 and momentum transfer |𝑡|, are between 9.1 GeV and 10.6 GeV and up to 4.5 GeV2, respectively. Recent results from analysis of the measured 2-D 𝐽/Ψ photoproduction cross section (e−e+ channel) will be presented. In addition,
preliminary results from analysis of muon channel will be also be shown.
