Chiral SU(3) theory of antikaon-nucleon interactions with improved threshold constraints

Yoichi Ikeda, Tetsuo Hyodo, Wolfram Weise

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K-nucleon interactions are investigated in the framework of coupled-channels dynamics based on the next-to-leading order chiral SU(3) meson-baryon effective Lagrangian. A recent determination of the 1s shift and width of kaonic hydrogen enables us to set accurate constraints on the coupled-channels meson-baryon amplitudes in the strangeness S=-1 sector. Theoretical uncertainties in the subthreshold extrapolation of the coupled-channels amplitudes are discussed. Using this framework, we give predictions for K --neutron interactions and for the spectrum of the Λ(1405) resonance. A simplified, effective three-channel model using leading order chiral SU(3) meson-baryon interactions is also constructed for convenient application in K-nuclear few-body calculations.

Original languageEnglish
Pages (from-to)98-114
Number of pages17
JournalNuclear Physics, Section A
StatePublished - 1 May 2012


  • Chiral dynamics
  • Chiral symmetry
  • KN interaction
  • Λ(1405) resonance


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