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

L. Tiator, M. Gorchtein, V. L. Kashevarov, K. Nikonov, M. Ostrick, M. Hadžimehmedović, R. Omerović, H. Osmanović, J. Stahov, A. Švarc
The European Physical Journal A

Received 13 July 2018,  Accepted 20 October 2018.  First Online 06 December 2018
DOI https://doi.org/10.1140/epja/i2018-12643-x 
Publisher Name Springer Berlin Heidelberg
Print ISSN 1434-6001 Online ISSN 1434-601X

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.
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