$\bar{K}\Lambda$ molecular explanation to the newly observed $\Xi (1620{)}^0$

Abstract

The newly observed $\Xi (1620{)}^0$ by the Belle Collaboration inspires our interest in performing a systematic study on the interaction of an anti-strange meson $({\bar{K}}^{(\ast )})$ with a strange or doubly strange ground octet baryon $\mathcal{B}$ ($\Lambda$, $\Sigma$, and $\Xi$), where the spin-orbit force and the recoil correction are considered in the adopted one-boson-exchange model. Our results indicate that $\Xi (1620{)}^0$ can be explained as a $\bar{K}\Lambda$ molecular state with $I(J^P)=1/2(1/2^{-})$ and the intermediate force from $\sigma$ exchange plays an important role. Additionally, we also predict several other possible molecular candidates, i.e., the $\bar{K}\Sigma$ molecular state with $I(J^P)=1/2(1/2^{-})$ and the triply strange $\bar{K}\Xi$ molecular state with $I(J^P)=0(1/2^{-})$.

arXiv comment7 pages, 5 figures, and 4 tables

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• Study ${\Xi }_c^{+}\to \Lambda {\bar{K}}^0{\pi }^{+}$ and search for the low-lying baryons $\Xi (1/2^{-})$ and $\Sigma (1/2^{-})$
• Structure of the $\mathbf{\Lambda }(1670)$ resonance
• Exploring the mass spectrum and the electromagnetic properties of the possible ${\Xi }_{cc}{K}^{(\ast )}$ and ${\Xi }_{cc}{\bar{K}}^{(\ast )}$ molecules
• Explanation of Y(4630) as hadronic resonant state
• Predicting possible molecular states of nucleons with ${\Xi }_c$, ${\Xi }_c^{\ast }$, and ${\Xi }_c^{\prime }$
• Possible ${\Sigma }_c^{\ast }\bar{\Sigma }$ molecular states
• Molecular pentaquarks composed of a ground-state octet baryon and a $P-$wave anticharmed meson
• Strong decays of the $\Xi (1620)$ as a $\Lambda \bar{K}$ and $\Sigma \bar{K}$ molecule