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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.
Afiliação
  • Rachek IA; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Arrington J; Argonne National Laboratory, Argonne, Illinois 60439, USA.
  • Dmitriev VF; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia and Novosibirsk State University, 630090 Novosibirsk, Russia.
  • Gauzshtein VV; Tomsk Polytechnic University, 634050 Tomsk, Russia.
  • Gerasimov RE; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia and Novosibirsk State University, 630090 Novosibirsk, Russia.
  • Gramolin AV; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Holt RJ; Argonne National Laboratory, Argonne, Illinois 60439, USA.
  • Kaminskiy VV; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Lazarenko BA; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Mishnev SI; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Muchnoi NY; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia and Novosibirsk State University, 630090 Novosibirsk, Russia.
  • Neufeld VV; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Nikolenko DM; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Sadykov RSh; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Shestakov YV; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Stibunov VN; Tomsk Polytechnic University, 634050 Tomsk, Russia.
  • Toporkov DK; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia and Novosibirsk State University, 630090 Novosibirsk, Russia.
  • de Vries H; Nikhef, 1098 XG Amsterdam, Netherlands.
  • Zevakov SA; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
  • Zhilich VN; Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia and Novosibirsk State University, 630090 Novosibirsk, Russia.
Phys Rev Lett ; 114(6): 062005, 2015 Feb 13.
Article em En | MEDLINE | ID: mdl-25723211
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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Base de dados: MEDLINE Idioma: En Ano de publicação: 2015 Tipo de documento: Article
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Base de dados: MEDLINE Idioma: En Ano de publicação: 2015 Tipo de documento: Article