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Abstract
We have investigated an essential K̄ cluster "K−pp", which is the simplest system of kaonic nuclei, with a coupled-channel Complex Scaling Method (ccCSM). Combining the ccCSM with Feshbach method we can handle a coupled-channel problem effectively as a singlechannel problem. As a result of a study of the K−pp with the ccCSM+Feshbach method using an energy-dependent chiral-theory based potential, it is found that the K−pp is shallowly bound with the binding energy of around 20-35 MeV. The mesonic decay width is rather dependent on the interaction parameters and ansatz; the half decay width is ranging from 20 to 65 MeV.
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