https://doi.org/10.1140/epja/i2018-12643-x
Regular Article - Theoretical Physics
Eta and etaprime photoproduction on the nucleon with the isobar model EtaMAID2018
1
Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099, 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: tiator@uni-mainz.de
Received:
13
July
2018
Accepted:
20
October
2018
Published online:
6
December
2018
The isobar model EtaMAID has been updated with new and high precision data for 
and 
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 
states contributing to photoproduction and 12 states contributing to 
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 
MeV is discussed, that would be able to explain unexpected energy and angular dependence of observables in 
near threshold.
© SIF, Springer-Verlag GmbH Germany, part of Springer Nature, 2018
