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The OLYMPUS Experiment
- Source :
- Nuclear instruments & methods in physics research / A 741, 1-17 (2014). doi:10.1016/j.nima.2013.12.035, Nuclear instruments & methods in physics research / A 741, 1-17 (2014).
- Publication Year :
- 2013
-
Abstract
- Nuclear instruments & methods in physics research / A 741, 1 - 17 (2014). doi:10.1016/j.nima.2013.12.035<br />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.<br />Published by North-Holland Publ. Co., Amsterdam
- 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
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Nuclear instruments & methods in physics research / A 741, 1-17 (2014). doi:10.1016/j.nima.2013.12.035, Nuclear instruments & methods in physics research / A 741, 1-17 (2014).
- Accession number :
- edsair.doi.dedup.....627b492b53cee09f6b0c9cd8ab3bbd9c