6533b852fe1ef96bd12aacf3
RESEARCH PRODUCT
Eta and Etaprime Photoproduction on the Nucleon with the Isobar Model EtaMAID2018
K. NikonovM. HadžimehmedovićR. OmerovićH. OsmanovićJ. StahovLothar TiatorM. OstrickMikhail GorchteinAlfred ŠVarcV. L. Kashevarovsubject
Nuclear and High Energy PhysicsParticle physicsNuclear TheoryQC1-999HadronNuclear TheoryFOS: Physical sciences01 natural sciencesNuclear physicsNuclear Theory (nucl-th)High Energy Physics - Phenomenology (hep-ph)0103 physical sciencesNuclear fusionNeutronNuclear Experiment (nucl-ex)010306 general physicsNuclear ExperimentNuclear ExperimentPhysics010308 nuclear & particles physicsPhysicsResonanceObservableHigh Energy Physics - PhenomenologyIsobarAngular dependenceHigh Energy Physics::ExperimentNucleondescription
The isobar model EtaMAID has been updated with new and high precision data for eta and etaprime photoproduction on protons and neutrons from MAMI, ELSA, GRAAL and CLAS. The background is described in a recently developed Regge-cut model, and for the resonance part the whole list of nucleon resonances has been investigated with 21 N* states contributing to eta photoproduction and 12 N* states contributing to etaprime photoproduction. A new approach is discussed to avoid double counting in the overlap region of Regge and resonances. A comparison is done among four newly updated partial waves analyses for observables and partial waves. Finally, the possibility of a narrow resonance near W=1900 MeV is discussed, that would be able to explain unexpected energy and angular dependence of observables in p(gamma,etaprime)p near etaprime threshold.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-01 |