Chiral dynamics and the S11(1535) nucleon resonance

N. Kaiser, P. B. Siegel, W. Weise

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309 Scopus citations

Abstract

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 S11(1535) nucleon resonance. In particular, we find a large partial decay width into ηN consistent with the empirical data.

Original languageEnglish
Pages (from-to)23-28
Number of pages6
JournalPhysics Letters B
Volume362
Issue number1-4
DOIs
StatePublished - 9 Nov 1995

Keywords

  • Chiral dynamics
  • Coupled channel S-matrix
  • Eta meson production
  • Kaon-hyperon bound state
  • Nucleon resonances

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