Investigation of K^barNN resonances with a coupled-channel Complex Scaling Method + Feshbach projection

We have investigated a prototype of kaonic nuclei, " K⁻pp", with a coupled-channel Complex Scaling Method (ccCSM). Combining the ccCSM with Feshbach projection method, we can handle a coupled-channel problem effectively as a single-channel problem. By using an energy-dependent chiral SU(3)-based $\overline{K}N$ potential, the K⁻pp (J^π=0⁻ and T=1/2) is obtained to be shallowly bound with the binding energy of 20-30 MeV. The mesonic decay width depends on the interaction parameters and ansatz; the decay width is ranging from 20 to 65 MeV. In case of J^π=1⁻ state, no three-body $\overline{K}NN$ resonant states are found.