Contribution to a conference proceedings/Internal Report

DESY-2014-00477

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Status of the OLYMPUS Experiment

Kohl, M. (Corresponding author)Extern*

2013

Report No.: CH.00001

Abstract: The OLYMPUS experiment at DESY has been carried out to quantify the effect of two-photon exchange in elasticlepton-proton scattering, which has been the favored explanation for the discrepancy in the form factor ratio between the Rosenbluth separation and polarization transfer methods. While the effect can not be calculated from first principles, it can be determined experimentally by comparing the positron-proton and electron-proton elastic cross sections. The OLYMPUS experiment has used intense stored positron and electron beams along with an internal unpolarized hydrogen target and a large acceptance detector to measure the ratio of elastic scattering cross sections. Particular emphasis has been put on optimal control of systematics, by redundantly monitoring luminosity, beam properties and detector efficiencies. Data taking has been completed in January 2013. An overview of the experiment will be given along with the status of the analysis.

Note: Abstract ID: BAPS.2013.DNP.CH.1Supported by DOE, NSF, BMBF, and DFG Supported by NSF grants PHY-0855473, 0959521, and 1207672, and by DOE Early Career Award DE-SC0003884

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Contributing Institute(s):

1. OLYMPUS Kollaboration (OLYMP)

Research Program(s):

1. Experiments at DORIS (OLYMPUS) (POF2-515) (POF2-515)

Experiment(s):

1. DORIS: OLYMPUS

Appears in the scientific report 2013

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Database coverage:

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