OLYMPUS and the proton form factor puzzle

Lauren Ice, Ricardo Alarcon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Recent measurements of the proton electric to magnetic form factor ratio using polarization techniques reveal a large discrepancy with measurements found using the Rosenbluth separation technique. It has been proposed that this discrepancy is due to a non-negligible multiple photon exchange contribution in the electron-proton elastic scattering cross section. The OLYMPUS experiment will measure the multiple photon exchange contribution by finding the cross section ratio of positron-proton to electron-proton scattering within 1%. The experiment will be carried out at the DESY laboratory in Hamburg Germany using the electron and positron storage ring DORIS and an internal unpolarized hydrogen gas target. The scattered particles will be detected using the Bates Large Acceptance Spectrometer Toroid (BLAST).

Original languageEnglish (US)
Title of host publicationIX Latin American Symposium on Nuclear Physics and Applications
Number of pages8
StatePublished - 2012
Event9th Latin American Symposium on Nuclear Physics and Applications - Quito, Ecuador
Duration: Jul 18 2011Jul 22 2011

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other9th Latin American Symposium on Nuclear Physics and Applications


  • Proton elastic form factors
  • two-photon exchange

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation


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