6533b86efe1ef96bd12cb5a2
RESEARCH PRODUCT
First Measurement of the $Q^2$ Dependence of the Beam-Normal Single Spin Asymmetry for Elastic Scattering off Carbon
P. HerrmannConcettina SfientiS. ŠIrcaK. AulenbacherM. DehnB. S. SchlimmeIvica FriščićF. E. MaasJ. MüllerJ. BeričičD. BosnarS. ŠTajnerM. HoekB. SpruckU. MüllerMichaela ThielKent PaschkeH. FonvieilleA. WeberS. BaunackS. KegelM. O. DistlerJ. PochodzallaT. KolarM. MihovilovicV. TioukineH. J. KreidelY. KohlC. PalatchiMikhail GorchteinAnselm EsserA. TyukinL. CorreaPatrick AchenbachM. SchothHarald MerkelS. HeidrichF. SchulzF. Nilliussubject
carbon: targetelectron: polarized beammedia_common.quotation_subjectGeneral Physics and AstronomyElectron[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]momentum transfer dependence01 natural sciencesAsymmetryMainz Linac0103 physical sciencesgallium: arsenicpolarization: transverseelektronsko raspršenje010306 general physicsNuclear ExperimentSpin-½media_commonPhysicsElastic scatteringform factor: ratioform factor: chargeexchange: two-photon010308 nuclear & particles physicsnucleus: targetizmjena dva fotonaelectron nucleus: elastic scatteringCharge (physics)amplitude analysisNATURAL SCIENCES. Physics.PRIRODNE ZNANOSTI. Fizika.spin: asymmetry: measuredElektronsko raspršenje izmjena dva fotonaAmplitudeCover (topology)High Energy Physics::ExperimentAtomic physicsradiation: laserBeam (structure)photoelectronexperimental resultsdescription
We report on the first Q^{2}-dependent measurement of the beam-normal single spin asymmetry A_{n} in the elastic scattering of 570 MeV vertically polarized electrons off ^{12}C. We cover the Q^{2} range between 0.02 and 0.05 GeV^{2}/c^{2} and determine A_{n} at four different Q^{2} values. The experimental results are compared to a theoretical calculation that relates A_{n} to the imaginary part of the two-photon exchange amplitude. The result emphasizes that the Q^{2} behavior of A_{n} given by the ratio of the Compton to charge form factors cannot be treated independently of the target nucleus.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-01-01 |