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Eta photoproduction in a combined analysis of pion- and photon-induced reactions

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Abstract

The ηN final state is isospin-selective and thus provides access to the spectrum of excited nucleons without being affected by excited Δ states. To this end, the world database on eta photoproduction off the proton up to a center-of-mass energy of E ∼ 2.3 GeV is analyzed, including data on differential cross sections, and single- and double-polarization observables. The resonance spectrum and its properties are determined in a combined analysis of eta and pion photoproduction off the proton together with the reactions πN → πN, ηN, KΛ and KΣ. For the analysis, the so-called Jülich coupled-channel framework is used, incorporating unitarity, analyticity, and effective three-body channels. Parameters tied to photoproduction and hadronic interactions are varied simultaneously. The influence of recent MAMI T and F asymmetry data on the eta photoproduction amplitude is discussed in detail.

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany

    D. Rönchen & U. -G. Meißner

  2. Institute for Nuclear Studies and Department of Physics, The George Washington University, 20052, Washington, DC, USA

    M. Döring & H. Haberzettl

  3. Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany

    J. Haidenbauer, U. -G. Meißner & K. Nakayama

  4. Institute for Advanced Simulation, Forschungszentrum Jülich, 52425, Jülich, Germany

    J. Haidenbauer & U. -G. Meißner

  5. Department of Physics and Astronomy, University of Georgia, 30602, Athens, Georgia, USA

    K. Nakayama

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  1. D. Rönchen
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  2. M. Döring
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Rönchen, D., Döring, M., Haberzettl, H. et al. Eta photoproduction in a combined analysis of pion- and photon-induced reactions. Eur. Phys. J. A 51, 70 (2015). https://doi.org/10.1140/epja/i2015-15070-7

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