Antikaon–nucleon interaction and Λ(1405) in chiral SU(3) dynamics

Yuki Kamiya, Kenta Miyahara, Shota Ohnishi, Yoichi Ikeda, Tetsuo Hyodo, Eulogio Oset, Wolfram Weise

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


The properties of the Λ(1405) resonance are key ingredients for determining the antikaon–nucleon interaction in strangeness nuclear physics, and the novel internal structure of the Λ(1405) is of great interest in hadron physics, as a prototype case of a baryon that does not fit into the simple three-quark picture. We show that a quantitative description of the antikaon–nucleon interaction with the Λ(1405) is achieved in the framework of chiral SU(3) dynamics, with the help of recent experimental progress. Further constraints on the K¯N subthreshold interaction are provided by analyzing πΣ spectra in various processes, such as the Kd→πΣn reaction and the Λc→ππΣ decay. The structure of the Λ(1405) is found to be dominated by an antikaon–nucleon molecular configuration, based on its wavefunction derived from a realistic K¯N potential and the compositeness criteria from a model-independent weak-binding relation.

Original languageEnglish
Pages (from-to)41-57
Number of pages17
JournalNuclear Physics, Section A
StatePublished - 1 Oct 2016


  • Chiral SU(3) dynamics
  • Compositeness
  • K¯N interaction
  • Λ(1405) resonance
  • πΣ spectrum


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