Eta and etaprime photoproduction on the nucleon with the isobar model EtaMAID2018

. The isobar model EtaMAID has been updated with new and high precision data for η and η 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 b...

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Bibliographic Details
Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2018-12, Vol.54 (12), p.1-32, Article 210
Main Authors: Tiator, L., Gorchtein, M., Kashevarov, V. L., Nikonov, K., Ostrick, M., Hadžimehmedović, M., Omerović, R., Osmanović, H., Stahov, J., Švarc, A.
Format: Article
Language:English
Subjects:
Dependence
Hadrons
Heavy Ions
Nuclear Fusion
Nuclear Physics
Particle and Nuclear Physics
Photoproduction
Physics
Physics and Astronomy
Regular Article - Theoretical Physics
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Summary:. The isobar model EtaMAID has been updated with new and high precision data for η and η 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 η photoproduction and 12 N * states contributing to η 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 ( γ , η ) p near η threshold.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/i2018-12643-x