Measurement of the Two-Photon Exchange Contribution to the Elastic e±p Scattering Cross Sections at the VEPP-3 Storage Ring

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. Yu.; Neufeld, V. V.; Nikolenko, D. M.; Sadykov, R. Sh.; Shestakov, Yu. V.; Stibunov, V. N.; Toporkov, D. K.; de Vries, H.; Zevakov, S. A.; Zhilich, V. N.

doi:10.1103/PhysRevLett.114.062005

Title: Measurement of the Two-Photon Exchange Contribution to the Elastic $e^{\pm} p$ Scattering Cross Sections at the VEPP-3 Storage Ring

Journal Article · Thu Feb 12 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.062005· OSTI ID:1392573

Rachek, I. A. ^[1]; Arrington, J. ^[2]; Dmitriev, V. F. ^[3]; Gauzshtein, V. V. ^[4]; Gerasimov, R. E. ^[3]; Gramolin, A. V. ^[1]; Holt, R. J. ^[2]; Kaminskiy, V. V. ^[1]; Lazarenko, B. A. ^[1]; Mishnev, S. I. ^[1]; Muchnoi, N. Yu. ^[3]; Neufeld, V. V. ^[1]; Nikolenko, D. M. ^[1]; Sadykov, R. Sh. ^[1]; Shestakov, Yu. V. ^[1]; Stibunov, V. N. ^[4]; Toporkov, D. K. ^[3]; de Vries, H. ^[5]; Zevakov, S. A. ^[1]; Zhilich, V. N. ^[3]

Budker Institute of Nuclear Physics, Novosibirsk (Russia)
Argonne National Lab. (ANL), Argonne, IL (United States)
Budker Institute of Nuclear Physics, Novosibirsk (Russia); Novosibirsk State Univ., Novosibirsk (Russia)
Tomsk Polytechnic Univ., Tomsk (Russia)
Nikhef, Amsterdam (The Netherlands)

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. Furthermore, the results are compared with several theoretical predictions.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Russian Federation, Ministry of Education and Science; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-06CH11357; MK-525.2013.2

OSTI ID:: 1392573

Alternate ID(s):: OSTI ID: 1180395

Journal Information:: Physical Review Letters, Vol. 114, Issue 6; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 78 works

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