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The interaction of the pseudoscalar meson and the baryon octet isinvestigated by solving the Bethe-Salpeter equation in the infinite and finitevolume respectively. It is found that there is a resonance state generateddynamically, which owns a mass about 1550MeV and a large decay width of120-200MeV. This resonance state couples strongly to the $\pi \Xi$ channel.Therefore, it might not correspond to the $\Xi(1620)$ particle announced byBelle collaboration. At the same time, this problem is studied in the finitevolume, and an energy level at 1570MeV is obtained, which is between the $\pi\Xi$ and $\bar{K}\Lambda$ thresholds and independent of the cubic box size.

The pseudoscalar meson and baryon octet interaction with strangeness $S=-2$ in the unitary coupled-channel approximation