Two-Photon Exchange: Future experimental prospects
Abstract
The proton elastic form factor ratio is accessible in unpolarized Rosenbluth-type experiments as well as experiments which make use of polarization degrees of freedom. The extracted values show a distinct discrepancy, growing with . Three recent experiments tested the proposed explanation, two-photon exchange, by measuring the positron-proton to electron-proton cross section ratio. In the results, a small two-photon exchange effect is visible, significantly different from theoretical calculation. Theory at larger momentum transfer remains untested. This paper discusses the possibilities for future measurements at larger momentum transfer.
Cite
@article{arxiv.1804.06665,
title = {Two-Photon Exchange: Future experimental prospects},
author = {Jan C. Bernauer},
journal= {arXiv preprint arXiv:1804.06665},
year = {2018}
}
Comments
7 pages, 4 figures. Contribution to the proceedings of the 11th International Workshop on the Physics of Excited Nucleons (NSTAR 2017)