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26 April 2024 |
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Nucleon resonances in pi N scattering up to energies sqrt(s) < 2.0 GeV | | Guan Yeu Chen
; S.S. Kamalov
; Shin Nan Yang
; D. Drechsel
; L. Tiator
; | | Date: |
29 Mar 2007 | | Abstract: | A meson-exchange model for pion-nucleon scattering was previously constructed using a three-dimensional reduction scheme of the Bethe-Salpeter equation for a model Lagrangian involving pi, eta, N, Delta,
ho, and sigma fields. We thereby extend our previous work by including the eta N channel and all the pi N resonances with masses ~ 2 GeV, up to the F waves. The effects of the pipi N channels are taken into account by introducing an effective width in the resonance propagators. The extended model gives an excellent fit to both pi N phase shifts and inelasticity parameters in all channels up to the F waves and for energies below 2 GeV. We present a new scheme to extract the properties of overlapping resonances. The predicted values for the resonance masses and widths as well as resonance pole positions and residues are compared to the listing of the Particle Data Group. | | Source: | arXiv, nucl-th/0703096 | | Services: | Forum | Review | PDF | Favorites | |
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