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

Abstract

The $\eta N$ final state is isospin-selective and thus provides access to the spectrum of excited nucleons without being affected by excited $\Delta$ states. To this end, the world database on eta photoproduction off the proton up to a center-of-mass energy of $E\sim 2.3$ 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 $\pi N\to \pi N$, $\eta N$, $K\Lambda$ and $K\Sigma$. 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.

21 pages, 10 figures. Updated to the published version

References in corpus (21)

• Big-Bang Nucleosynthesis
• Extended Partial-Wave Analysis of piN Scattering Data
• The Flavor Structure of the Excited Baryon Spectra from Lattice QCD
• Analytic properties of the scattering amplitude and resonances parameters in a meson exchange model
• Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
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• Gauge-invariant approach to meson photoproduction including the final-state interaction
• The reaction pi+ p --> K+ Sigma+ in a unitary coupled-channels model
• Further evidence for N(1900)P_{13} from photoproduction of hyperons
• Relevance of complex branch points for partial wave analysis
• Measurement of the transverse target and beam-target asymmetries in $\eta$ meson photoproduction at MAMI
• Nucleon resonances in πN scattering up to energies \sqrt(s) < 2.0 GeV
• Origin of the second peak in the cross section of the $K^{+}\Lambda$ photoproduction
• Pole positions and residues from pion photoproduction using the Laurent+Pietarinen expansion method
• The piN --> etaN data demand the existence of N(1710) P11 resonance reducing the 1700 MeV continuum ambiguity
• Production of $\eta$ and ${\eta }^{\prime }$ Mesons on Nucleons and Nuclei
• Pion-nucleon charge-exchange amplitudes above 2 GeV
• Pole structure from energy-dependent and single-energy fits to $\pi N$ elastic scattering data
• Amplitude extraction in pseudoscalar-meson photoproduction: towards a situation of complete information

Cited by in corpus (6)

• Three-body Unitarity with Isobars Revisited
• Strong evidence for nucleon resonances near 1900\,MeV
• Model Selection for Pion Photoproduction
• Differential Cross Section Measurements for $\gamma n\to {\pi }^{-}p$ Above the First Nucleon Resonance Region
• $N^{\ast }$ resonances from $K\Lambda$ amplitudes in sliced bins in energy
• Double polarisation experiments in meson photoproduction