Search results for "electron p: elastic scattering"

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Study of Two-Photon Exchange via the Beam Transverse Single Spin Asymmetry in Electron-Proton Elastic Scattering at Forward Angles over a Wide Energy…

2020

We report on a new measurement of the beam transverse single spin asymmetry in electron-proton elastic scattering, $A^{ep}_{\perp}$, at five beam energies from 315.1 MeV to 1508.4 MeV and at a scattering angle of $30^{\circ} < \theta < 40^{\circ}$. The covered $Q^2$ values are 0.032, 0.057, 0.082, 0.218, 0.613 (GeV/c)$^2$. The measurement clearly indicates significant inelastic contributions to the two-photon-exchange (TPE) amplitude in the low-$Q^2$ kinematic region. No theoretical calculation is able to reproduce our result. Comparison with a calculation based on unitarity, which only takes into account elastic and $\mathrm{\pi N}$ inelastic intermediate states, suggests that there are ot…

Protonmedia_common.quotation_subjectFOS: Physical sciencesGeneral Physics and AstronomyElectron[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesAsymmetrybeam: energyelectron p: elastic scatteringpi nucleon: intermediate statebenchmark0103 physical scienceseta nucleonpolarization: transverseunitarityNuclear Experiment (nucl-ex)010306 general physicsNuclear Experimentmedia_commonSpin-½PhysicsElastic scatteringexchange: two-photonUnitarityScatteringscattering3. Good healthtransverseintermediate state* Automatic Keywords *kinematicsElementary Particles and FieldsHigh Energy Physics::ExperimentAtomic physicsspin: asymmetryBeam (structure)experimental resultsPhysical Review Letters
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The OLYMPUS Experiment

2014

Nuclear instruments &amp; methods in physics research / A 741, 1 - 17 (2014). doi:10.1016/j.nima.2013.12.035

two-photon [exchange]Physics - Instrumentation and DetectorsPhysics::Instrumentation and DetectorsHadronluminosity: monitoringRecoil4-MOMENTUM TRANSFERSNuclear Experiment (nucl-ex)Nuclear ExperimentInstrumentationNuclear ExperimentPhysicsElastic scatteringLuminosity (scattering theory)ELECTROMAGNETIC FORM-FACTORSInstrumentation and Detectors (physics.ins-det)elastic scattering [cross section]positron p: elastic scatteringAntimatterdrift chamberelastic scattering [electron p]target [hydrogen]proportional chamberCROSS-SECTIONNuclear and High Energy PhysicsELECTRON-PROTONDESY DORIS StorFOS: Physical sciencesmonitoring [luminosity]time-of-flight530electron p: elastic scatteringNuclear physicsCross section (physics)RATIO(GEV/C)(2)p: form factor: ratiocalorimeterddc:530cross section: elastic scatteringactivity reporthydrogen: targetexchange: two-photonScatteringPOSITRONSDESYelastic scattering [positron p]magnetic spectrometerELECTROMAGNETIC FORM-FACTORS; PROTON ELASTIC-SCATTERING; 4-MOMENTUM TRANSFERS; ELECTRON-PROTON; CROSS-SECTION; RATIO; (GEV/C)(2); POSITRONSform factor: ratio [p]gas electron multiplierPhysics::Accelerator PhysicsPROTON ELASTIC-SCATTERINGHigh Energy Physics::Experiment
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