The energies and residues of the nucleon resonances N(1535) and N(1650)

Abstract

We extract pole positions for the N(1535) and N(1650) resonances using two different models. The positions are determined from fits to different subsets of the existing $\pi N\to \pi N$, $\pi N\to \eta N$ and $\gamma p\to \eta p$ data and found to be 1515(10)--i85(15)MeV and 1660(10)--i65(10)MeV, when the data is described in terms of two poles. Sensitivity to the choice of fitted data is explored. The corresponding $\pi \pi$ and $\eta \eta$ residues of these poles are also extracted.

9 pages

References in corpus (4)

• Chiral Dynamics and the $S_{11}(1535)$ Nucleon Resonance
• Updated analysis of $\pi$N elastic scattering data to 2.1~GeV: The Baryon Spectrum
• A unitary model for meson-nucleon scattering
• The Eta-Nucleon Scattering Length and Effective Range

Cited by in corpus (8)

• Coupled-channel dynamics in the reactions piN --> piN, etaN, KLambda, KSigma
• eta-Nucleon Scattering Length and Effective Range uncertainties
• A coupled K-matrix description of the reactions pi+N -> pi+N, pi+N -> eta+N, gamma+N -> pi+N and gamma+N -> eta+N
• Model dependence of single-energy fits to pion photoproduction data
• Final state interactions in the eta-d system
• Toward a unified description of hadro- and photoproduction: S-wave pi- and eta-photoproduction amplitudes
• Pole versus Breit-Wigner resonance description of the orbitally excited baryons
• πN and ηp deexcitation channels of the N^* and Δbaryonic resonances between 1470 and 1680 MeV