Abstract
We derive a single-channel effective \(\bar{K}\!N\) interaction from chiral SU(3) coupled-channel dynamics, emphasizing the important role of the πΣ channel and the structure of the Λ(1405) resonance. The chiral low energy theorem requires strongly attractive interaction not only in the \(\bar{K}\!N\) channel but also in the πΣ channel. As a consequence of the strong πΣ dynamics, the equivalent potential in single \(\bar{K}\!N\) channel turns out to be less attractive than the one used in a purely phenomenological approach.
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Hyodo, T., Weise, W. Effective \(\boldsymbol{\bar{K}\!N}\) interaction with strong πΣ dynamics constrained by chiral SU(3) symmetry. Hyperfine Interact 193, 237–243 (2009). https://doi.org/10.1007/s10751-009-0006-9
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DOI: https://doi.org/10.1007/s10751-009-0006-9