$Ξ(1690)$ as a $\bar{K} Σ$ molecular state

We show that a $Ξ^{\ast}$ pole can be dynamically generated near the $\bar{K} Σ$ threshold as an $s$-wave $\bar{K} Σ$ molecular state in a coupled-channels unitary approach with the leading-order chiral interaction. This $Ξ^{\ast}$ state can be identified with the $Ξ(1690)$ resonance with $J^{P} = 1/2^{-}$. We find that the experimental $\bar{K}^{0} Λ$ and $K^{-} Σ^{+}$ mass spectra are qualitatively reproduced with the $Ξ^{\ast}$ state. Moreover we theoretically investigate properties of the dynamically generated $Ξ^{\ast}$ state.

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