Status of the OLYMPUS experiment

Ricardo Alarcon, Lauren Ice

Research output: Contribution to journalArticle

Abstract

The OLYMPUS experiment will determine the multiple-photon exchange contribution to elastic lepton-proton scattering. The motivation for this experiment comes from an inconsistency in measurements of the proton electric-To-magnetic form factor ratio between the Rosenbluth separation and polarization techniques. It is expected that neglected multiple-photon exchange contributions to elastic lepton-proton scattering distort the extracted form factors and are the cause of this discrepancy. Determining the multiple-photon exchange contribution can be achieved by measuring the positron-proton to electron-proton elastic scattering cross section ratio. OLYMPUS was designed to measure this cross section ratio to better than 1% uncertainty for a wide range of four-momentum transfer and virtual photon polarization. The data for the ratio were taken in 2012 using 2.01 GeV electron and positron beams incident on a hydrogen target. The data analysis is currently underway with preliminary results expected by November 2015.

Original languageEnglish (US)
Article number071
JournalUnknown Journal
Volume29-June-2015
StatePublished - 2015

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Protons
Photons
Electrons
Positrons
Experiments
Ion exchange
Scattering
Polarization
Elastic scattering
Momentum transfer
Uncertainty
Hydrogen

ASJC Scopus subject areas

  • General

Cite this

Alarcon, R., & Ice, L. (2015). Status of the OLYMPUS experiment. Unknown Journal, 29-June-2015, [071].

Status of the OLYMPUS experiment. / Alarcon, Ricardo; Ice, Lauren.

In: Unknown Journal, Vol. 29-June-2015, 071, 2015.

Research output: Contribution to journalArticle

Alarcon, R & Ice, L 2015, 'Status of the OLYMPUS experiment', Unknown Journal, vol. 29-June-2015, 071.
Alarcon, Ricardo ; Ice, Lauren. / Status of the OLYMPUS experiment. In: Unknown Journal. 2015 ; Vol. 29-June-2015.
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