skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer

Abstract

We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer by using a quark-parton representation of virtual Compton scattering. We thus can relate the two-photon exchange amplitude to the generalized parton distributions which also enter in other wide-angle scattering processes. We find that the interference of one- and two-photon exchange contribution is able to substantially resolve the difference between electric form factor measurements from Rosenbluth and polarization transfer experiments. Two-photon exchange has additional consequences which could be experimentally observed, including nonzero polarization effects and a positron-proton/electron-proton scattering asymmetry. The predicted Rosenbluth plot is no longer precisely linear; it acquires a measurable curvature, particularly at large laboratory angle.

Authors:
 [1];  [2];  [3];  [4];  [1]
  1. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
  2. SLAC, Stanford University, Stanford, California 94309 (United States)
  3. Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States)
  4. Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China)
Publication Date:
OSTI Identifier:
20711041
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 72; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.72.013008; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; ASYMMETRY; COMPTON EFFECT; DISTRIBUTION; ELECTROMAGNETIC FORM FACTORS; ELECTRON-PROTON INTERACTIONS; ELECTRONS; INTERFERENCE; MOMENTUM TRANSFER; PHOTONS; POLARIZATION; PROTONS; QUARK MODEL; QUARKS

Citation Formats

Afanasev, Andrei V, Brodsky, Stanley J, Carlson, Carl E, Chen, Y -C, Vanderhaeghen, Marc, and Department of Physics, College of William and Mary, Williamsburg, Virginia 23187. Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.013008.
Afanasev, Andrei V, Brodsky, Stanley J, Carlson, Carl E, Chen, Y -C, Vanderhaeghen, Marc, & Department of Physics, College of William and Mary, Williamsburg, Virginia 23187. Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer. United States. doi:10.1103/PhysRevD.72.013008.
Afanasev, Andrei V, Brodsky, Stanley J, Carlson, Carl E, Chen, Y -C, Vanderhaeghen, Marc, and Department of Physics, College of William and Mary, Williamsburg, Virginia 23187. Fri . "Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer". United States. doi:10.1103/PhysRevD.72.013008.
@article{osti_20711041,
title = {Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer},
author = {Afanasev, Andrei V and Brodsky, Stanley J and Carlson, Carl E and Chen, Y -C and Vanderhaeghen, Marc and Department of Physics, College of William and Mary, Williamsburg, Virginia 23187},
abstractNote = {We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer by using a quark-parton representation of virtual Compton scattering. We thus can relate the two-photon exchange amplitude to the generalized parton distributions which also enter in other wide-angle scattering processes. We find that the interference of one- and two-photon exchange contribution is able to substantially resolve the difference between electric form factor measurements from Rosenbluth and polarization transfer experiments. Two-photon exchange has additional consequences which could be experimentally observed, including nonzero polarization effects and a positron-proton/electron-proton scattering asymmetry. The predicted Rosenbluth plot is no longer precisely linear; it acquires a measurable curvature, particularly at large laboratory angle.},
doi = {10.1103/PhysRevD.72.013008},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 1,
volume = 72,
place = {United States},
year = {2005},
month = {7}
}