Two-photon exchange and elastic electron-proton scattering
Nuclear Theory
2008-11-26 v2 High Energy Physics - Phenomenology
Abstract
Two-photon exchange contributions to elastic electron-proton scattering cross sections are evaluated in a simple hadronic model including the finite size of the proton. The corrections are found to be small in magnitude, but with a strong angular dependence at fixed . This is significant for the Rosenbluth technique for determining the ratio of the electric and magnetic form factors of the proton at high , and partly reconciles the apparent discrepancy with the results of the polarization transfer technique.
Cite
@article{arxiv.nucl-th/0306076,
title = {Two-photon exchange and elastic electron-proton scattering},
author = {P. G. Blunden and W. Melnitchouk and J. A. Tjon},
journal= {arXiv preprint arXiv:nucl-th/0306076},
year = {2008}
}
Comments
4 pages, 4 figures, v2: additional references and minor clarifications in text, accepted in Physical Review Letters