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Related Experiment Videos

Deeply virtual compton scattering off the neutron.

M Mazouz1, A Camsonne, C Muñoz Camacho

  • 1LPSC, Université Joseph Fourier, CNRS/IN2P3, INPG, F-38026 Grenoble, France.

Physical Review Letters
|February 1, 2008
PubMed

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Summary
This summary is machine-generated.

This experiment uses interference between deeply virtual Compton scattering (DVCS) and Bethe-Heitler processes to determine the imaginary part of DVCS amplitudes. This provides new constraints on generalized parton distributions (GPDs) and nucleon spin contributions.

Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Deeply Virtual Compton Scattering (DVCS) probes the internal structure of nucleons.
  • Generalized Parton Distributions (GPDs) offer a 3D picture of quarks and gluons within hadrons.
  • The Bethe-Heitler process provides a reference for interference measurements.

Purpose of the Study:

  • To extract the imaginary part of DVCS amplitudes for neutrons and deuterons.
  • To constrain the least understood GPD, E_q.
  • To deduce model-dependent constraints on quark contributions to nucleon spin.

Main Methods:

  • Exploiting interference between DVCS and Bethe-Heitler processes.
  • Measuring the helicity-dependent D(e,e'gamma)X cross section.

Related Experiment Videos

  • Analyzing data at Q^2=1.9 GeV^2 and x_B=0.36.

    • Main Results:

    • Successfully extracted the imaginary part of DVCS amplitudes.
    • Obtained a linear combination of GPDs sensitive to E_q.
    • Deduced constraints on the contribution of up and down quarks to nucleon spin.

    Conclusions:

    • The interference method is effective for probing GPDs.
    • New insights into the nucleon spin puzzle are provided.
    • Further theoretical and experimental work can refine these constraints.