Deeply Virtual Compton Scattering Cross Section at High Bjorken x_{B}

Area of Science:

• Nuclear Physics
• Particle Physics
• Quantum Chromodynamics

Background:

• Deeply Virtual Compton Scattering (DVCS) probes the generalized parton distributions (GPDs) of nucleons.
• GPDs offer a 3D picture of nucleon internal structure, crucial for understanding quark-gluon interactions.
• Previous studies have faced challenges in precisely extracting all GPD-related observables.

Purpose of the Study:

• To perform high-precision measurements of the DVCS cross section at high Bjorken variable xB.
• To experimentally extract all four helicity-conserving Compton Form Factors (CFFs) as a function of xB.
• To systematically include helicity-flip amplitudes in the analysis for a comprehensive understanding.

Main Methods:

• Utilized high-precision measurements of the DVCS cross section.
• Employed the exact analytic expression of the DVCS cross section, considering all polarization states.
• Analyzed data as a function of the Bjorken variable xB, incorporating helicity-flip amplitudes.

Main Results:

• Achieved high-precision measurements of the DVCS cross section at high xB.
• Presented the first experimental extraction of all four helicity-conserving CFFs.
• Demonstrated the sensitivity of the data to poorly known CFFs due to high accuracy.

Conclusions:

• The study provides crucial experimental constraints on nucleon GPDs.
• The extracted CFFs advance the 3D imaging of the nucleon's internal structure.
• High-precision DVCS measurements are vital for refining theoretical models of nucleon structure.