Extended coupled channels model for pi N scattering and the structure of N*(1440) and N*(1535)
1998
14 pages
Published in:
- Phys.Rev.C 57 (1998) 1464-1477
Citations per year
Abstract: (APS)
We present a coupled channels model for πN scattering based on N, Δ, and NS11*(1535) pole and nonpole contributions, plus correlated 2π and a0 meson exchange. The open channels considered are πN, ηN, σN, and πΔ. The model gives a qualitatively good fit to the phase shifts and elasticity parameters in both isospin channels for partial waves up to J=32 and πN c.m. energies of 1.4 GeV. Above that energy the appearance of resonances in various partial waves precludes a precise fit to the data without explicitly including resonances in those partial waves and—probably—additional inelastic channels. Within the model the NS11*(1535) resonance appears to require a genuine three-quark component, whereas the NP11*(1440) resonance appears to permit description as a purely dynamical effect.- pi nucleon: interaction
- partial wave analysis: coupled channel
- meson: exchange
- f0(600)
- nucleon: exchange
- nucleon resonance: exchange
- N(1440)
- N(1535)
- coupling constant
- partial wave
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