Two-photon exchange and elastic scattering of electrons/positrons on the proton. (Proposal for an experiment at VEPP-3)

Abstract

It has been suggested that two-photon exchange corrections could explain the discrepancy between Rosenbluth extractions of the proton form factors and recent polarization transfer measurements. We propose a precise comparison of electron-proton and positron-proton scattering at Q^2=1.6 GeV^2 to determine if two-photon exchange at moderate Q^2 values is in fact able to explain the discrepancy.

13 pages, 10 figures. Proposal for a comparison of electron-proton and positron-proton scattering at VEPP-3

References in corpus (2)

• How well do we know the electromagnetic form factors of the proton?
• The complete experiment for $e^{\mp }N$ elastic scattering in presence of two-photon exchange

Cited by in corpus (12)

• Two-photon exchange in elastic electron-nucleon scattering
• Nucleon electromagnetic form factors
• Two-photon exchange in elastic electron-proton scattering
• Low Q^2 measurements of the proton form factor ratio $m{u}_p{G}_E/G_M$
• Extraction of two-photon contributions to the proton form factors
• Analyzing power in elastic scattering of the electrons off a spin-0 target
• Dispersive contributions to $e^{+}p/e^{-}p$ cross section ratio in forward regime
• Measurement of the two-photon exchange contribution in elastic $ep$ scattering at VEPP-3
• The ratio of $e^{\pm }p$ scattering cross sections predicted from the global fit of elastic $ep$ data
• Polarization transfer measurements of proton form factors: deformation by initial collinear photons
• Coulomb corrections in the extraction of the proton radius
• Space- and time-like electromagnetic form factors of the nucleon