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|a Bernauer, Jan Christopher
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|a Massachusetts Institute of Technology. Laboratory for Nuclear Science
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|a Two-Photon Exchange: Future Experimental Prospects
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|b Springer Vienna,
|c 2021-11-24T16:16:33Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/131800.2
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|a 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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|a Office of Nuclear Physics of the U.S. Department of Energy (Grant DE-FG02-94ER40818)
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