Deeply Virtual Compton Scattering Cross Section at High Bjorken xB

We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values of the Bjorken variable x(B). DVCS is sensitive to the generalized parton distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of the initial and final electron and nucleon, and final state photon, we present the first experimental extraction of all four helicity-conserving Compton form factors (CFFs) of the nucleon as a function of x(B), while systematically including helicity flip amplitudes. In particular, the high accuracy of the present data demonstrates sensitivity to some very poorly known CFFs.

Automated summary

We present high-precision measurements of the deep virtual Compton scattering (DVCS) cross section at high values of the Bjorken variable x(B). This measurement provides valuable information about the generalized parton distributions of the nucleon and allows for a three-dimensional description of its internal constituents. Our experimental extraction of all four helicity-conserving Compton form factors (CFFs) for the nucleon, as a function of x(B), demonstrates sensitivity to poorly known CFFs and showcases the high accuracy of our data.