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Related Experiment Videos

Two-photon exchange and elastic electron-proton scattering.

P G Blunden1, W Melnitchouk, J A Tjon

  • 1Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2.

Physical Review Letters
|November 13, 2003
PubMed
Summary

Two-photon exchange corrections to electron-proton scattering are small but angularly dependent. This finding impacts how proton form factors are measured, reconciling experimental discrepancies.

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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Electrodynamics

Background:

  • Elastic electron-proton scattering is crucial for understanding proton structure.
  • Discrepancies exist between Rosenbluth and polarization transfer techniques for proton form factors.

Purpose of the Study:

  • To evaluate two-photon exchange contributions in elastic electron-proton scattering.
  • To assess the impact of these corrections on proton form factor measurements.

Main Methods:

  • A simple hadronic model was employed.
  • Finite proton size was incorporated into the model.
  • Calculations focused on cross sections at fixed momentum transfer (Q2).

Main Results:

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  • Two-photon exchange contributions were found to be small in magnitude.
  • These corrections exhibit a strong angular dependence at fixed Q2.
  • The findings partially resolve discrepancies between experimental techniques.

    • Conclusions:

    • Two-photon exchange effects are significant for accurate proton form factor determination.
    • The angular dependence is key for reconciling Rosenbluth and polarization transfer data.
    • This work refines our understanding of proton structure at high Q2.