Deeply Virtual Compton Scattering Beam Spin Asymmetry with CLAS12 at 6.5 GeV and 7.5 GeV Polarized Electron Beam with CLAS12

Deeply Virtual Compton Scattering (DVCS) is the cleanest channel in accessing the Generalized Parton Distributions (GPDs) which encode the 3D imaging of the nucleon structure in terms of the 1D longitudinal momentum fraction of the nucleon’s constituent correlated to its 2D transverse position. As the name DVCS summarizes, the nucleon is probed deeply to the level of its constituent quarks by the scattered electron which generates the virtual photon interacting with one of the quarks, eventually resulting to the emission of a high-energy real photon from the recoiling nucleon. The detection of DVCS final-state particles, however, is not unique as scattered electrons themselves can emit photons in the co-occurring Bethe-Heitler reaction. By conducting DVCS experiments at different beam energies, DVCS amplitude can be separated from DVCS-BH interference amplitude thus allowing the extraction of GPD Η in some kinematics, and eventually the gravitational d1(t) form factor, which provides access to the mechanical properties of the nucleon. Jefferson Lab’s electron beam’s high luminosity and high polarization, together with the large-acceptance CLAS12 detector system installed in Hall B of Jefferson Lab provide the ideal setup for multi-energy DVCS experiments with efficient particle detection in broad kinematic ranges. DVCS data were collected with CLAS12 in 2018 at 6.5 GeV, 7.5 GeV, and 10.6 GeV electron beam energies on liquid hydrogen target. We will present the results on one of the vital DVCS observables from our measurements at 6.5 GeV and 7.5 GeV beam energies: the Beam-Spin Asymmetry, which is particularly sensitive to the H GPD and is an essential ingredient in extracting the d1(t) form factor.