Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment

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Henderson, Brian; Ice, Lauren; Ates, Ozgur; Avetisyan, Albert; Beck, Reinhard; Belostotski, Stanislav; Bessuille, Jason; Brinker, Frank; Calarco, John; Carassiti, V.; Cisbani, E.; Ciullo, G.; Khaneft, Dmitry; Contalbrigo, Marco; De Leo, R.; Diefenbach, Juergen; Donnelly, T. W.; Dow, Karen; Elbakian, G.; Eversheim, P. D.; Frullani, Salvatore; Funke, Christian; Gavrilov, Gennady; O'Connor, Colton; Gläser, B.; Goerrissen, Nico; Hasell, Douglas; Hauschildt, Jan; Hoffmeister, Philipp; Holler, Yorck; ... view all 71 authors

The OLYMPUS collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, $\it R_{2 \gamma}$, a direct measure of the contribution of hard two-photon exchange to the elastic cross section. In the OLYMPUS measurem... View more
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