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

The European Physical Journal A(2018)

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摘要
. 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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关键词
etaprime photoproduction,isobar model,nucleon
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