Nuclear Physics Seminar

"When one photon is not enough"

Presented by Alexander Winnebeck, MIT

Tuesday, May 29, 2012, 11:00 am — Small Seminar Room, Bldg. 510

The discrepancy in the form factor ratio (Ge/Gm) versus Q^2 between experiments using the Rosenbluth technique and those using recoil polarization measurements is nowadays believed to arise from exchanging not only a single photon in elastic lepton proton scattering, but also having contributions from two or more photons. To verify that this is the case and also to give a quantitativ measure of the multi-photon contribution there are three experiments in progress. In this talk I will show how one can measure the two photon contribution in elastic lepton scattering and how the OLYMPUS experiment is doing it. Beside explaining the sub detectors, I will also show some results from the first beam time in February 2012, and give an outlook for the near future.

Hosted by: Matthew Lamont

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