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Theory Seminar
KEK 素粒子原子核研究所・理論セミナー
(Abstract)
Three-body resonances in the \bar{K}NN system have been studied within a framework of the \bar{K}NN-\pi\Sigma N coupled channel Faddeev equation. By solving the three-body equation the energy dependence of the resonant \bar{K}N amplitude is fully taken into account. The S-matrix pole has been investigated from the eigenvalue of the kernel with the analytic continuation of the scattering amplitude on the unphysical Riemann sheet. The \bar{K}N interaction is constructed from the leading order term of the chiral Lagrangian using relativistic kinematics. The \Lambda(1405) resonance is dynamically generated in this model, where the \bar{K}N interaction parameters are fitted to the data of scattering length. As a result we find a three-body resonance of the strange dibaryon system with binding energy, 80 MeV, and width, 73$ MeV. The energy of the three-body resonance is found to be sensitive to the model of the $I=0$ \bar{K}N interaction.