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Title: The Two-Photon Exchange Contribution to Elastic Electron-Nucleon Scattering 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:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC), Menlo Park, CA
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
839738
Report Number(s):
SLAC-PUB-10990
TRN: US0503516
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; ASYMMETRY; COMPTON EFFECT; FORM FACTORS; MOMENTUM TRANSFER; PARTONS; POLARIZATION; SCATTERING

Citation Formats

Afanasev, A. The Two-Photon Exchange Contribution to Elastic Electron-Nucleon Scattering at Large Momentum Transfer. United States: N. p., 2005. Web. doi:10.2172/839738.
Afanasev, A. The Two-Photon Exchange Contribution to Elastic Electron-Nucleon Scattering at Large Momentum Transfer. United States. doi:10.2172/839738.
Afanasev, A. Wed . "The Two-Photon Exchange Contribution to Elastic Electron-Nucleon Scattering at Large Momentum Transfer". United States. doi:10.2172/839738. https://www.osti.gov/servlets/purl/839738.
@article{osti_839738,
title = {The Two-Photon Exchange Contribution to Elastic Electron-Nucleon Scattering at Large Momentum Transfer},
author = {Afanasev, A},
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 = {10.2172/839738},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {2}
}

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