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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Electrodynamics

Background:

  • Proton structure is probed using elastic electron-proton scattering.
  • Discrepancies between cross-section measurements and polarization data suggest contributions beyond one-photon exchange.
  • Two-photon exchange (TPE) is a higher-order effect in quantum electrodynamics.

Purpose of the Study:

  • To present new precision measurements of the elastic electron-proton scattering cross section.
  • To improve the extraction of the proton magnetic form factor at high momentum transfer (Q^2).
  • To investigate the role of hard two-photon exchange (TPE) effects in high Q^2 scattering.

Main Methods:

  • Precision measurements of elastic electron-proton scattering cross sections.
  • Analysis of cross-section data up to Q^2 = 15.75 (GeV/c)^2.
  • Comparison of scattering data with polarization measurements.

Main Results:

  • Extended the range of Q^2 for longitudinal/transverse separation of the cross section.
  • Observed a discrepancy between cross-section and polarization data up to Q^2 = 8 (GeV/c)^2.
  • Quantified TPE contributions needed to explain high Q^2 cross-section data.

Conclusions:

  • New data confirm and extend the range of TPE effects in electron-proton scattering.
  • The findings provide crucial insights into proton structure and higher-order QED corrections.
  • Improved understanding of TPE is essential for precise determination of the proton magnetic form factor.