• Medientyp: E-Artikel
  • Titel: Eta photoproduction in a combined analysis of pion- and photon-induced reactions
  • Beteiligte: Rönchen, D. [VerfasserIn]; Döring, M. [VerfasserIn]; Haberzettl, H. [VerfasserIn]; Haidenbauer, J. [VerfasserIn]; Meißner, U. -G. [VerfasserIn]; Nakayama, K. [VerfasserIn]
  • Erschienen: Springer, 2015
  • Erschienen in: The European physical journal / A 51(6), 70 (2015). doi:10.1140/epja/i2015-15070-7
  • Sprache: Englisch
  • DOI: https://doi.org/10.1140/epja/i2015-15070-7
  • ISSN: 1431-5831; 1434-6001; 1434-601X
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  • Beschreibung: 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.
  • Zugangsstatus: Freier Zugang