Two-Photon Exchange: Future Experimental Prospects
Author(s)Bernauer, Jan C
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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.
Few-Body Systems. 2018 Jul 18;59(6):116
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