Chiral dynamics and the S11(1535) nucleon resonance

The SU(3) chiral effective lagrangian at next-to-leading order is applied to the S-wave meson-baryon interaction in the energy range around the ηN threshold. A potential is derived from this lagrangian and used in a coupled channel calculation of the πN, ηN, KΛ, KΣ system in the isospin- 1 2 , l = 0...

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Bibliographic Details
Published in:Physics letters. B 1995-11, Vol.362 (1), p.23-28
Main Authors: Kaiser, N, Siegel, P.B, Weise, W
Format: Article
Language:English
Subjects:
Chiral dynamics
Coupled channel S-matrix
Eta meson production
Kaon-hyperon bound state
Nucleon resonances
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Summary:The SU(3) chiral effective lagrangian at next-to-leading order is applied to the S-wave meson-baryon interaction in the energy range around the ηN threshold. A potential is derived from this lagrangian and used in a coupled channel calculation of the πN, ηN, KΛ, KΣ system in the isospin- 1 2 , l = 0 partial wave. Using the same parameters as obtained previously from a fit to the low energy KN data it is found that a quasi-bound KΣ- KΛ-state is formed, with properties remarkably similar to the S 11(1535) nucleon resonance. In particular, we find a large partial decay width into ηN consistent with the empirical data.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(95)01203-3