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

  • Regular Article - Theoretical Physics
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Abstract.

The isobar model EtaMAID has been updated with new and high precision data for \(\eta\) and \(\eta^{\prime}\) 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 \(N^{\ast}\) states contributing to \(\eta\) photoproduction and 12 \(N^{\ast}\) states contributing to \( \eta^\prime\) 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 \( p(\gamma,\eta^{\prime})p\) near \(\eta^{\prime}\) threshold.

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Authors and Affiliations

  1. Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099, Mainz, Germany

    L. Tiator, M. Gorchtein, V. L. Kashevarov, K. Nikonov & M. Ostrick

  2. University of Tuzla, Faculty of Natural Sciences and Mathematics, Univerzitetska 4, 75000, Tuzla, Bosnia and Herzegovina

    M. Hadžimehmedović, R. Omerović, H. Osmanović & J. Stahov

  3. Rudjer Bošković Institute, Bijenička cesta 54, P.O. Box 180, 10002, Zagreb, Croatia

    A. Švarc

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  1. L. Tiator
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  2. M. Gorchtein
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  3. V. L. Kashevarov
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  4. K. Nikonov
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  5. M. Ostrick
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  6. M. Hadžimehmedović
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  7. R. Omerović
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  8. H. Osmanović
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  9. J. Stahov
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  10. A. Švarc
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Correspondence to L. Tiator.

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Communicated by U.-G. Meißner

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Tiator, L., Gorchtein, M., Kashevarov, V.L. et al. Eta and etaprime photoproduction on the nucleon with the isobar model EtaMAID2018. Eur. Phys. J. A 54, 210 (2018). https://doi.org/10.1140/epja/i2018-12643-x

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