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

F Georges1, M N H Rashad2, A Stefanko3

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|July 8, 2022
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Summary
This summary is machine-generated.

High-precision measurements of deeply virtual Compton scattering (DVCS) reveal nucleon generalized parton distributions. This study presents the first experimental extraction of all four helicity-conserving Compton form factors (CFFs).

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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.