0000000000472059

AUTHOR

P. Kravchenko

showing 3 related works from this author

Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on a longitudinally polarized deuterium target

2010

Azimuthal asymmetries in exclusive electroproduction of a real photon from a longitudinally polarized deuterium target are measured with respect to target polarization alone and with respect to target polarization combined with beam helicity and/or beam charge. The asymmetries appear in the distribution of the real photons in the azimuthal angle $\phi$ around the virtual photon direction, relative to the lepton scattering plane. The asymmetries arise from the deeply virtual Compton scattering process and its interference with the Bethe-Heitler process. The results for the beam-charge and beam-helicity asymmetries from a tensor polarized deuterium target with vanishing vector polarization ar…

Nuclear and High Energy Physics/dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energyEVOLUTION KERNELS010308 nuclear & particles physicsGENERALIZED PARTON DISTRIBUTIONS; IMPACT PARAMETER SPACE; ELECTRON STORAGE-RING; EVOLUTION KERNELS; HERA; SPIN; NUCLEON; QCDHERAIMPACT PARAMETER SPACEFOS: Physical sciencesQCD01 natural sciencesHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)ELECTRON STORAGE-RINGSPINGENERALIZED PARTON DISTRIBUTIONS0103 physical sciencesddc:530High Energy Physics::ExperimentSDG 7 - Affordable and Clean EnergyNUCLEON010306 general physics
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Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering

2009

The nuclear-mass dependence of azimuthal cross section asymmetries with respect to charge and longitudinal polarization of the lepton beam is studiedfor hard exclusive electroproduction of real photons. The observed beam-charge and beam-helicity asymmetries are attributed to the interference between the Bethe-Heitler and deeply virtual Compton scattering processes. For various nuclei, the asymmetries are extracted for both coherent and incoherent-enriched regions, which involve different (combinations of) generalized parton distributions. For both regions, the asymmetries are compared to those for a free proton, and no nuclear-mass dependence is found.

Nuclear and High Energy PhysicsParticle physicsPhotonNuclear TheoryHERAFOS: Physical sciencesIMPACT PARAMETER SPACEPartonGENERALIZED PARTON DISTRIBUTIONS; IMPACT PARAMETER SPACE; SPIN; HERA01 natural sciences7. Clean energyHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)GENERALIZED PARTON DISTRIBUTIONS0103 physical sciencesddc:530Nuclear Experiment010306 general physicsPhysicsElastic scattering010308 nuclear & particles physicsScatteringCompton scatteringHERASPINPhysics::Accelerator PhysicsHigh Energy Physics::ExperimentNucleonBeam (structure)
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Measurement of trace impurities in ultra pure hydrogen and deuterium at the parts-per-billion level using gas chromatography

2018

Abstract A series of muon experiments at the Paul Scherrer Institute in Switzerland deploy ultra-pure hydrogen active targets. A new gas impurity analysis technique was developed, based on conventional gas chromatography, with the capability to measure part-per-billion (ppb) traces of nitrogen and oxygen in hydrogen and deuterium. Key ingredients are a cryogenic admixture accumulation, a directly connected sampling system and a dedicated calibration setup. The dependence of the measured concentration on the sample volume was investigated, confirming that all impurities from the sample gas are collected in the accumulation column and measured with the gas chromatograph. The system was calibr…

PhysicsNuclear and High Energy PhysicsHydrogenAnalytical chemistryParts-per notationchemistry.chemical_element02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesNitrogenDilutionchemistryDeuteriumImpurity0103 physical sciencesGas chromatography010306 general physics0210 nano-technologyInstrumentationGas chromatography ion detectorNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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