Eta and Etaprime Photoproduction on the Nucleon with the Isobar Model EtaMAID2018
1 Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Mainz, Germany
2 University of Tuzla, Faculty of Natural Sciences and Mathematics, Univerzitetska 4, 75000 Tuzla, Bosnia and Herzegovina
3 Rudjer Bošković Institute, Bijenička cesta 54, P.O. Box 180, 10002 Zagreb, Croatia
* e-mail: firstname.lastname@example.org
Published online: 1 February 2019
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. 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.
© The Authors, published by EDP Sciences, 2019
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