Double-pole structure on a prototype of kaonic nuclei 'K⁻pp'

We have investigated a prototype system of kaonic nuclei, 'K⁻pp', with a coupled-channel Complex Scaling Method combined with Feshbach projection, using an energy-dependent K-barN potential based on chiral SU(3) theory. A deeply bound state with huge decay width is obtained as a candidate of self-consistent solutions (a quasi self-consistent solution), in addition to the shallowly bound state with 20–30 MeV binding energy. As a result, we consider that the 'K⁻pp' has a double-pole structure as well as the excited hyperon Λ(1405). Furthermore, we expect that the signal observed in DISTO and J-PARC E27 experiments might be related to the lower-pole state of the 'K⁻pp'. (author)