Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.062005
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Funding
- Grant Council of the President of the Russian Federation [MK-525.2013.2]
- Ministry of Education and Science of the Russian Federation [02.740.11.0245.1]
- Russian Foundation for Basic Research [12-02-00560, 12-02-33140, 13-02-00991, 13-02-01023]
- US Department of Energy [DE-AC02-06CH11357]
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The ratio of the elastic e(+)p to e(-)p scattering cross sections has been measured precisely, allowing the determination of the two-photon exchange contribution to these processes. This neglected contribution is believed to be the cause of the discrepancy between the Rosenbluth and polarization transfer methods of measuring the proton electromagnetic form factors. The experiment was performed at the VEPP-3 storage ring at beam energies of 1.6 and 1.0 GeV and at lepton scattering angles between 15 degrees and 105 degrees. The data obtained show evidence of a significant two-photon exchange effect. The results are compared with several theoretical predictions.
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