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

Abstract

The coupled pi+N, eta+N, gamma+N systems are described by a K-matrix method. The parameters in this model are adjusted to get an optimal fit to pi+N -> pi+N, pi+N -> eta+N, gamma+N -> pi+N and gamma+N -> eta+N data in an energy range of about 100 MeV each side of the eta-threshold. The coupling of photons to the N(1535) state is extracted and also an alternative to the current S11(gamma+N -> pi+N) amplitudes suggested. Expansions are given for the eta-eta and gamma-eta amplitudes in terms of the eta-momentum. Effects of interference of this state with background potential interactions are discussed and experimental consequences are indicated.

19 pages, latex, 5 figures

Cited by in corpus (30)

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• Coupled-channels study of the ${\pi }^{-}p\to \eta n$ process
• Low-energy etaN interactions: scattering lengths and resonance parameters
• Eta-N Final State Interaction in incoherent Photoproduction of Eta-mesons from the Deuteron near Threshold
• Determination of the ${\mathbf{\eta }}^3\mathrm{He}$ threshold structure from the low energy $\mathbf{pd}\to {\mathbf{\eta }}^3\mathrm{He}$ reaction
• Search for Quasi Bound $\eta$ Mesons
• Eta-mesic nuclei: past, present, future
• Model dependence of single-energy fits to pion photoproduction data
• eta d scattering in the region of the S11 resonance
• Photoproduction of mesons from nuclei - In-medium properties of hadrons
• Final state interactions in the eta-d system
• $\eta$-meson in nuclear matter
• Small eta-N scattering lengths favour eta-d and eta-alpha states
• Nonexistence of a $\eta NN$ quasibound state
• Interference and nuclear medium effects on the eta-mesic nuclear spectrum
• Few-body aspects of the near threshold pseudoscalar meson production
• Toward a unified description of hadro- and photoproduction: S-wave pi- and eta-photoproduction amplitudes
• Two-body effects in coherent eta-meson photoproduction on the deuteron in the region of the S_11(1535) resonance
• Renormalization of the f0(980) and a0(980) scalar resonances in a nuclear medium
• $\eta$ mesons in hot and dense asymmetric nuclear matter
• Relativistic description of the np to eta d reaction near threshold
• Coherent Photoproduction of eta-mesons on Three-Nucleon Systems