DVCS off the Neutron: E08-025 Jlab Hall A Experiment
2019 August 19
2019 August 23
Generalized parton distributions (GPDs) are considered as suitable tools to study the internal structure of hadrons in terms of quarks and gluons. The Measurement of Deeply Virtual Compton Scattering (DVCS) cross sections is the simplest way to access GPDs. In particular, DVCS off the neutron is sensitive to GPD E, the least constrained GPD, which is needed to determine the quark angular momentum via Ji's sum rule. E08-025 experiment was performed in Jlab Hall A to measure the unpolarized cross section of photon electroproduction off a deuterium target at $Q^2=1.75$ GeV$^2$ and $x_B=0.36$. After a brief description of the experimental setup, we will show the main steps of the data analysis. Finally, we will present our preliminary results on the photon electroproduction off the neutron and coherent deuteron, indicating for the first time a non-zero DVCS signal.