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Two-Photon Physics in Hadronic Processes

Two-Photon Physics in Hadronic Processes

Authors :
Carl E. Carlson
Marc Vanderhaeghen
Source :
Annual Review of Nuclear and Particle Science. 57:171-204
Publication Year :
2007
Publisher :
Annual Reviews, 2007.

Abstract

Two-photon exchange contributions to elastic electron-scattering are reviewed. The apparent discrepancy in the extraction of elastic nucleon form factors between unpolarized Rosenbluth and polarization transfer experiments is discussed, as well as the understanding of this puzzle in terms of two-photon exchange corrections. Calculations of such corrections both within partonic and hadronic frameworks are reviewed. In view of recent spin-dependent electron scattering data, the relation of the two-photon exchange process to the hyperfine splitting in hydrogen is critically examined. The imaginary part of the two-photon exchange amplitude as can be accessed from the beam normal spin asymmetry in elastic electron-nucleon scattering is reviewed. Further extensions and open issues in this field are outlined.<br />Review prepared for Annual Review of Nuclear and Particle Science; 41 pages, 21 figures

Details

ISSN :
15454134 and 01638998
Volume :
57
Database :
OpenAIRE
Journal :
Annual Review of Nuclear and Particle Science
Accession number :
edsair.doi.dedup.....ed4176d8254ac4ffb0f4d24f004dc489
Full Text :
https://doi.org/10.1146/annurev.nucl.57.090506.123116