Genuine two-channel calculations of 3-body bound states and resonances

We present a method to carry out genuine two-channel calculations of 3-body bound and quasi-bound states. Our model potential consist of two 3-body potential surfaces interacting through a localized coupling. The method allows us to obtain 3-body bound state energies and resonance lifetimes. The method employs the 'slow' variable discretization method [1], and complex absorbing potential for lifetime calculations. It can be used with long-range and short-range potentials. Particularly, it can be used to calculate true 3-body Feshbach resonances, including Efimov-type states. \newline \newline [1] O.~I.~Tolstikhin, S.~Watanabe, and M.~Matsuzawa, J. Phys. B: At. Mol. Opt. Phys. {\bf 29}, L389 (1996).