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Title: Proton form factors and two-photon exchange in elastic electron-proton scattering

Proton electromagnetic form factors are among the most important sources of information about the internal structure of the proton. Two different methods for measuring these form factors, the method proposed by Rosenbluth and the polarization-transfer method, yield contradictory results. It is assumed that this contradiction can be removed upon taking into account the hard part of the contribution of two-photon exchange to the cross section for elastic electron-proton scattering. This contribution can measured experimentally via a precision comparison of the cross sections for the elastic scattering of positrons and electrons on protons. Such a measurement, performed at the VEPP-3 storage ring in Novosibirsk at the beam energies of 1.6 and 1.0 GeV for positron (electron) scattering angles in the ranges of θ{sub e} = 15°–25° and 55°–75° in the first case and in the range of θ{sub e} = 65°–105° in the second case is described in the present article. Preliminary results of this experiment and their comparison with theoretical predictions are described.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ; ; ; ; ; ; ; ; ; ; ; ;  [1] ;  [4] ;  [1] ;  [2] more »; « less
  1. Russian Academy of Sciences, Budker Institute of Nuclear Physics, Siberian Branch (Russian Federation)
  2. Argonne National Laboratory (United States)
  3. NIKHEF (Netherlands)
  4. National Research Tomsk Polytechnic University, Physical-Technical Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22472293
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 78; Journal Issue: 3; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS SECTIONS; ELASTIC SCATTERING; ELECTROMAGNETIC FORM FACTORS; ELECTRON-POSITRON INTERACTIONS; ELECTRON-PROTON INTERACTIONS; ELECTRONS; GEV RANGE; PHOTONS; POLARIZATION; POSITRONS; PROTONS; VEPP-3