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DTSTART;TZID=America/Los_Angeles:20170227T120000
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UID:153-1488196800-1488200400@inpa.lbl.gov
SUMMARY:Lauren Ice (ASU) - Measurement of the Two-Photon Exchange Contribution to Elastic Lepton-Proton Scattering with the OLYMPUS Experiment
DESCRIPTION:The OLYMPUS experiment measured the two-photon exchange contribution to elastic electron-proton scattering\, which is thought to be the most likely candidate to resolve the discrepancy observed between polarized and unpolarized measurements of the proton electric-to-magnetic form factor ratio. To deterimine the two-photon exchange contribtuion\, OLYMPUS measured the positron-proton to electron-proton elastic scattering cross section ratio over a wide range of four-momentum transfer from 0.6 < Q2 < 2.2 (GeV/c)2 and virtual photon polarizaton from 0.456 <  < 0.978. The two-photon exchange contribution is correlated to the deviation of the cross section ratio from unity. \nIn 2012\, the OLYMPUS experiment collected over 4 fb−1 of e+p and e−p scatter-ing data using electron and positron beams incident on a hydrogen gas target. The scattered leptons and protons were measured exclusively with a large acceptance spec-\ntrometer. OLYMPUS observed a slight rise in σe+p/σe−p of at most 1-2% over the Q2 range. This talk will discuss the motivations\, experiment\, analysis method\, and the preliminary results for the cross section ratio as measured by OLYMPUS.
URL:https://inpa.lbl.gov/event/lauren-ice/
LOCATION:50B-4205
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