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

Arrington, J.; Dmitriev, V. F.; Holt, R. J.; Nikolenko, D. M.; Rachek, I. A.; Shestakov, Yu. V.; Stibunov, V. N.; Toporkov, D. K.; de Vries, H.

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

Authors

Description

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