Overview and Status of the OLYMPUS Experiment

Details Overview and Status of the OLYMPUS Experiment Overview and Status of the OLYMPUS Experiment

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprw14001r&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #W14.001

Physics

Scientific paper

Analysis via Rosenbluth separation of elastic electron-proton scattering has long yielded the ratio of the electric and magnetic form factors (GE/GM) to be constant as a function of Q^2. More recent studies using polarized beams, extracting GE/GM through the polarization transfer technique, show it to decrease linearly with Q^2. It is suspected that two-photon exchange processes explain the observed discrepancy, though theoretical calculations vary dramatically. OLYMPUS measures the two-photon contribution by studying the ratio of the cross section for electron-proton scattering to positron-proton scattering using DORIS at DESY. With multi-GEV beam energies and >100 mA current on an internal hydrogen gas target, OLYMPUS will be able to precisely measure two-proton exchange for 0.5<=Q^2<=2.5 GeV^2. An update of the status of the experiment, and its 2012 data run, will be presented.

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