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We report the first measurement of the average of the electron-proton andpositron-proton elastic scattering cross sections. This lepton charge-averagedcross section is insensitive to the leading effects of hard two-photonexchange, giving more robust access to the proton's electromagnetic formfactors. The cross section was extracted from data taken by the OLYMPUSexperiment at DESY, in which alternating stored electron and positron beamswere scattered from a windowless gaseous hydrogen target. Elastic scatteringevents were identified from the coincident detection of the scattered leptonand recoil proton in a large-acceptance toroidal spectrometer. The luminositywas determined from the rates of M{\o}ller, Bhabha and elastic scattering inforward electromagnetic calorimeters. The data provide some selectivity betweenexisting form factor global fits and will provide valuable constraints tofuture fits.

Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment