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| Journal Article | DESY-2014-01887 |
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2014
North-Holland Publ. Co.
Amsterdam
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Please use a persistent id in citations: doi:10.1016/j.nima.2013.12.035 doi:10.3204/DESY-2014-01887
Abstract: The OLYMPUS experiment was designed to measure the ratio between the positron-proton and electron-proton elastic scattering cross sections, with the goal of determining the contribution of two-photon exchange to the elastic cross section. Two-photon exchange might resolve the discrepancy between measurements of the proton form factor ratio, $\mu_p G^p_E/G^p_M$, made using polarization techniques and those made in unpolarized experiments. OLYMPUS operated on the DORIS storage ring at DESY, alternating between 2.01~GeV electron and positron beams incident on an internal hydrogen gas target. The experiment used a toroidal magnetic spectrometer instrumented with drift chambers and time-of-flight detectors to measure rates for elastic scattering over the polar angular range of approximately $25^\circ$--$75^\circ$. Symmetric M{\o}ller/Bhabha calorimeters at $1.29^\circ$ and telescopes of GEM and MWPC detectors at $12^\circ$ served as luminosity monitors. A total luminosity of approximately 4.5~fb$^{-1}$ was collected over two running periods in 2012. This paper provides details on the accelerator, target, detectors, and operation of the experiment.
Keyword(s): Form-factor ratio (LCSH) ; Two-photon exchange (LCSH) ; Elastic positron scattering (LCSH) ; Elastic electron scattering (LCSH) ; activity report ; exchange: two-photon ; cross section: elastic scattering ; electron p: elastic scattering ; positron p: elastic scattering ; p: form factor: ratio ; hydrogen: target ; gas electron multiplier ; magnetic spectrometer ; proportional chamber ; DESY DORIS Stor ; time-of-flight ; drift chamber ; calorimeter ; luminosity: monitoring
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Preprint
The OLYMPUS Experiment
Nuclear instruments & methods in physics research / A 741, 1-17 (2014)
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