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The effective Kbar N interaction based on chiral SU(3) coupled-channeldynamics is derived and its extrapolation below the Kbar N threshold is studiedin detail. Starting from the coupled-channel scattering equations, we eliminatethe channels other than Kbar N and obtain an effective interaction in thesingle Kbar N channel. An equivalent local potential in coordinate space isconstructed such as to reproduce the full scattering amplitude of the chiralSU(3) coupled-channel framework. We discuss several realistic chiralSU(3)-based models in comparison to reach conclusions about the uncertaintiesinvolved. It turns out that, in the region relevant to the discussion of deeplybound Kbar-nuclear few-body systems, the resulting energy-dependent, equivalentlocal potential is substantially less attractive than the one suggested inprevious purely phenomenological treatments.

Effective Kbar N interaction based on chiral SU(3) dynamics