Measurement of the two-photon exchange contribution in elastic ep scattering at VEPP–3
| Autor: | Yu. V. Shestakov, R. Sh. Sadykov, B. A. Lazarenko, V.V. Neufeld, J. Arrington, L.M. Barkov, D. K. Toporkov, H. de Vries, V. V. Gauzshtein, N. Yu. Muchnoi, V.N. Zhilich, A. V. Gramolin, I. A. Rachek, R. A. Golovin, V. N. Stibunov, Vladimir Dmitriev, S.I. Mishnev, V. V. Kaminsky, S. A. Zevakov, R. J. Holt, D. M. Nikolenko |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Nuclear and High Energy Physics Hydrogen Scattering FOS: Physical sciences chemistry.chemical_element Electron Atomic and Molecular Physics and Optics High Energy Physics - Experiment Nuclear physics High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Positron Two-photon excitation microscopy chemistry Radiative transfer High Energy Physics::Experiment Nuclear Experiment (nucl-ex) Nuclear Experiment Beam energy Storage ring |
| Zdroj: | Nuclear Physics B - Proceedings Supplements. :216-220 |
| ISSN: | 0920-5632 |
| Popis: | 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 $\theta = 55 \div 75^{\circ}$ and $\theta = 15 \div 25^{\circ}$) and 1 GeV ($\theta = 65 \div 105^{\circ}$). We briefly describe the experimental method, paying special attention to the radiative corrections. Some preliminary results are presented. Comment: 5 pages, 6 figures and 1 table; contribution to the Proceedings of the PHIPSI11 Workshop (Novosibirsk, Russia, 19-22 September 2011) |
| Databáze: | OpenAIRE |
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