| Title: |
The OLYMPUS experiment |
| Authors: |
Milner, R.; Hasell, D. K.; Beck, R.; Belostotski, S.; Bernauer, J. C.; Bessuille, J.; Brinker, F.; Buck, B.; Calarco, J. R.; Carassiti, V.; Cisbani, E.; Ciullo, G.; Kohl, M.; Contalbrigo, M.; D'Ascenzo, N.; De Leo, R.; Diefenbach, J.; Donnelly, T. W.; Dow, K.; Elbakian, G.; Eversheim, D.; Frullani, S.; Funke, Ch.; Schneekloth, U.; Gavrilov, G.; Gläser, B.; Görrissen, N.; Hauschildt, J.; Henderson, B. S.; Hoffmeister, Ph.; Holler, Y.; Ice, L. D.; Izotov, A.; Kaiser, R.; Akopov, N.; Karyan, G.; Kelsey, J.; Khaneft, D.; Klassen, P.; Kiselev, A.; Krivshich, A.; Lehmann, I.; Lenisa, P.; Lenz, D.; Lumsden, S.; Alarcon, R.; Ma, Y.; Maas, F.; Marukyan, H.; Miklukho, O.; Movsisyan, A.; Murray, M.; Naryshkin, Y.; O'Connor, C.; Perez Benito, R.; Perrino, R.; Andreev, V. A.; Redwine, R. P.; Rodríguez Piñeiro, D.; Rosner, G.; Russell, R. L.; Schmidt, A.; Seitz, B.; Statera, M.; Thiel, A.; Vardanyan, H.; Veretennikov, D.; Ates, O.; Vidal, C.; Winnebeck, A.; Yeganov, V.; OLYMPUS Collaboration; Avetisyan, A.; Bayadilov, D. |
| Source: |
Nuclear instruments & methods in physics research / A 741, 1 - 17 (2014). doi:10.1016/j.nima.2013.12.035 |
| Publisher Information: |
North-Holland Publ. Co. |
| Publication Year: |
2014 |
| Collection: |
DESY Publication Database (PUBDB) |
| Subject Terms: |
info:eu-repo/classification/ddc/530; 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 |
| Subject Geographic: |
DE |
| Description: |
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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| ISSN: |
1872-9576; 0168-9002 |
| Relation: |
info:eu-repo/semantics/altIdentifier/issn/1872-9576; info:eu-repo/semantics/altIdentifier/wos/WOS:000331833100001; info:eu-repo/semantics/altIdentifier/issn/0168-9002 |
| Availability: |
https://bib-pubdb1.desy.de/record/167552; https://bib-pubdb1.desy.de/search?p=id:%22DESY-2014-01887%22 |
| Rights: |
info:eu-repo/semantics/embargoedAccess |
| Accession Number: |
edsbas.7D817AC1 |
| Database: |
BASE |