Measurement of the two-photon exchange contribution in elastic ep scattering at VEPP-3

A. V. Gramolin, J. Arrington, L. M. Barkov, V. F. Dmitriev, V. V. Gauzshtein, R. A. Golovin, R. J. Holt, V. V. Kaminsky, B. A. Lazarenko, S. I. Mishnev, N. Yu Muchnoi, V. V. Neufeld, D. M. Nikolenko, I. A. Rachek, R. Sh Sadykov, Yu V. Shestakov, V. N. Stibunov, D. K. Toporkov, H. de Vries, S. A. ZevakovV. N. Zhilich

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16 Citations (Scopus)


We report on the status of the Novosibirsk experiment on a precision measurement of the ratio R of the elastic e +p and e -p scattering cross sections. Such measurements determine the two-photon exchange effect in elastic electron-proton scattering. The experiment is conducted at the VEPP-3 storage ring using a hydrogen internal gas target. The ratio R is measured with a beam energy of 1.6 GeV (electron/positron scattering angles are θ=55÷75° and θ=15÷25°) and 1 GeV (θ=65÷105°). We briefly describe the experimental method, paying special attention to the radiative corrections. Some preliminary results are presented.

Original languageEnglish
Pages (from-to)216-220
Number of pages5
JournalNuclear Physics B - Proceedings Supplements
Publication statusPublished - 1 Apr 2012


  • Elastic electron-proton scattering
  • Electromagnetic form factors of the proton
  • Two-photon exchange

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics

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