Role of $Ξ(1690)$ in the $J/ψ\toΞ^0\barΛK^0$ reaction
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| Format: | Preprint |
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2026
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| _version_ | 1866917412674207744 |
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| author | Lyu, Wen-Tao Dai, Lian-Rong Oset, Eulogio |
| author_facet | Lyu, Wen-Tao Dai, Lian-Rong Oset, Eulogio |
| contents | Motivated by the recent BESIII measurements of the $J/ψ\to Ξ^0 \barΛK_S^0 + c.c.$ process, we investigate this reaction by considering the contributions from the $Ξ(1690)$ and $Λ(1890)$ resonances. The $Ξ(1690)$ state is dynamically generated from the $S$-wave pseudoscalar meson-octet baryon interactions within the chiral unitary approach. Our theoretical model provides a good description of the $\barΛK^0$, $Ξ^0 K^0$, and $\barΛΞ^0$ invariant mass distributions. The results indicate that the $Ξ(1690)$ resonance, which was neglected in the experimental analysis by BESIII, plays a crucial role in this process. Furthermore, we evaluate the theoretical uncertainties of our model using the parametric bootstrap method. Future high-precision measurements of this process will further help to elucidate the properties of the $Ξ(1690)$ and $Λ(1890)$ states. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_16640 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Role of $Ξ(1690)$ in the $J/ψ\toΞ^0\barΛK^0$ reaction Lyu, Wen-Tao Dai, Lian-Rong Oset, Eulogio High Energy Physics - Phenomenology Motivated by the recent BESIII measurements of the $J/ψ\to Ξ^0 \barΛK_S^0 + c.c.$ process, we investigate this reaction by considering the contributions from the $Ξ(1690)$ and $Λ(1890)$ resonances. The $Ξ(1690)$ state is dynamically generated from the $S$-wave pseudoscalar meson-octet baryon interactions within the chiral unitary approach. Our theoretical model provides a good description of the $\barΛK^0$, $Ξ^0 K^0$, and $\barΛΞ^0$ invariant mass distributions. The results indicate that the $Ξ(1690)$ resonance, which was neglected in the experimental analysis by BESIII, plays a crucial role in this process. Furthermore, we evaluate the theoretical uncertainties of our model using the parametric bootstrap method. Future high-precision measurements of this process will further help to elucidate the properties of the $Ξ(1690)$ and $Λ(1890)$ states. |
| title | Role of $Ξ(1690)$ in the $J/ψ\toΞ^0\barΛK^0$ reaction |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2603.16640 |