1. The OLYMPUS Experiment
- Author
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B. Buck, H. Vardanyan, D. Rodríguez Piñeiro, M. Statera, Alexander Kiselev, O. Ates, A. Movsisyan, B. Gläser, J. Kelsey, Y. Holler, C. O'Connor, J. Diefenbach, Frank Brinker, J. R. Calarco, G. Ciullo, D. Khaneft, R. Pérez Benito, A. Thiel, D. Veretennikov, T.W. Donnelly, Ph. Hoffmeister, D. Hasell, Brian S. Henderson, R. Russell, S. Frullani, Morgan Murray, G. Rosner, G. Elbakian, P. Klassen, D. Eversheim, S. Lumsden, I. Lehmann, A. Avetisyan, R. Perrino, Paolo Lenisa, N. Akopov, N. D'Ascenzo, D. Bayadilov, O. Miklukho, J. Hauschildt, G. Karyan, J. Bessuille, D. Lenz, Alexander Schmidt, E. Cisbani, Ch. Funke, R. P. Redwine, V. Yeganov, Genady Gavrilov, Lauren Ice, V. A. Andreev, A. Krivshich, V. Carassiti, Ross Milner, Y. Naryshkin, M. Contalbrigo, Jan C. Bernauer, K. A. Dow, B. Seitz, U. Schneekloth, R. Beck, N. Görrissen, H. Marukyan, R. De Leo, A. Winnebeck, Andrey V. Izotov, C. Vidal, Michael Kohl, Ralf Kaiser, F. E. Maas, Ricardo Alarcon, S. Belostotski, and Y. Ma
- Subjects
two-photon [exchange] ,Physics - Instrumentation and Detectors ,Physics::Instrumentation and Detectors ,Hadron ,luminosity: monitoring ,Recoil ,4-MOMENTUM TRANSFERS ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment ,Instrumentation ,Physics ,Elastic scattering ,Luminosity (scattering theory) ,ELECTROMAGNETIC FORM-FACTORS ,Instrumentation and Detectors (physics.ins-det) ,elastic scattering [cross section] ,positron p: elastic scattering ,Antimatter ,drift chamber ,elastic scattering [electron p] ,target [hydrogen] ,proportional chamber ,CROSS-SECTION ,Nuclear and High Energy Physics ,ELECTRON-PROTON ,DESY DORIS Stor ,FOS: Physical sciences ,monitoring [luminosity] ,time-of-flight ,electron p: elastic scattering ,Nuclear physics ,Cross section (physics) ,RATIO ,(GEV/C)(2) ,p: form factor: ratio ,calorimeter ,ddc:530 ,cross section: elastic scattering ,activity report ,hydrogen: target ,exchange: two-photon ,Scattering ,POSITRONS ,DESY ,elastic scattering [positron p] ,magnetic spectrometer ,PROTON ELASTIC-SCATTERING ,form factor: ratio [p] ,gas electron multiplier ,Physics::Accelerator Physics ,High Energy Physics::Experiment - Abstract
Nuclear instruments & methods in physics research / A 741, 1 - 17 (2014). doi:10.1016/j.nima.2013.12.035, 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., Published by North-Holland Publ. Co., Amsterdam
- Published
- 2013
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