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Rachek IA, Arrington J, Dmitriev VF, et al. Measurement of the two-photon exchange contribution to the elastic e(±)p scattering cross sections at the VEPP-3 storage ring. Phys Rev Lett. 2015;114(6):062005doi: 10.1103/PhysRevLett.114.062005.
Rachek, I. A., Arrington, J., Dmitriev, V. F., Gauzshtein, V. V., Gerasimov, R. E., Gramolin, A. V., Holt, R. J., Kaminskiy, V. V., Lazarenko, B. A., Mishnev, S. I., Muchnoi, N. Y., Neufeld, V. V., Nikolenko, D. M., Sadykov, R. S. h., Shestakov, Y. V., Stibunov, V. N., Toporkov, D. K., de Vries, H., Zevakov, S. A., & Zhilich, V. N. (2015). Measurement of the two-photon exchange contribution to the elastic e(±)p scattering cross sections at the VEPP-3 storage ring. Physical review letters, 114(6), 062005. https://doi.org/10.1103/PhysRevLett.114.062005
Rachek, I A, et al. "Measurement of the two-photon exchange contribution to the elastic e(±)p scattering cross sections at the VEPP-3 storage ring." Physical review letters vol. 114,6 (2015): 062005. doi: https://doi.org/10.1103/PhysRevLett.114.062005
Rachek IA, Arrington J, Dmitriev VF, Gauzshtein VV, Gerasimov RE, Gramolin AV, Holt RJ, Kaminskiy VV, Lazarenko BA, Mishnev SI, Muchnoi NY, Neufeld VV, Nikolenko DM, Sadykov RSh, Shestakov YV, Stibunov VN, Toporkov DK, de Vries H, Zevakov SA, Zhilich VN. Measurement of the two-photon exchange contribution to the elastic e(±)p scattering cross sections at the VEPP-3 storage ring. Phys Rev Lett. 2015 Feb 13;114(6):062005. doi: 10.1103/PhysRevLett.114.062005. Epub 2015 Feb 12. PMID: 25723211.
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Phys Rev Lett. 2015 Feb 13;114(6):062005. doi: 10.1103/PhysRevLett.114.062005. Epub 2015 Feb 12.

Measurement of the two-photon exchange contribution to the elastic e(±)p scattering cross sections at the VEPP-3 storage ring.

Physical review letters

I A Rachek, J Arrington, V F Dmitriev, V V Gauzshtein, R E Gerasimov, A V Gramolin, R J Holt, V V Kaminskiy, B A Lazarenko, S I Mishnev, N Yu Muchnoi, V V Neufeld, D M Nikolenko, R Sh Sadykov, Yu V Shestakov, V N Stibunov, D K Toporkov, H de Vries, S A Zevakov, V N Zhilich

Affiliations

  1. Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  2. Argonne National Laboratory, Argonne, Illinois 60439, USA.
  3. Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia and Novosibirsk State University, 630090 Novosibirsk, Russia.
  4. Tomsk Polytechnic University, 634050 Tomsk, Russia.
  5. Nikhef, 1098 XG Amsterdam, Netherlands.

PMID: 25723211 DOI: 10.1103/PhysRevLett.114.062005

Abstract

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° and 105°. The data obtained show evidence of a significant two-photon exchange effect. The results are compared with several theoretical predictions.

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