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Two-Photon Exchange: Future Experimental Prospects
Name
601_2018_1439_ReferencePDF.pdf
Size
317.61 KB
Format
Adobe PDF
Checksum (MD5)
56357cbbaa571dde7b0299a639d9e50e
Author(s)
Bernauer, Jan C
Date Issued
July 18, 2018
Publisher
Springer Vienna
Citation
Few-Body Systems. 2018 Jul 18;59(6):116
Version
Author's final manuscript
Abstract
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
$$Q^2$$
Q
2
. 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 hard two-photon exchange effect at the couple-of-percent level 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.
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DOI of Published Version
https://doi.org/10.1007/s00601-018-1439-y
