One or two poles for the $Ξ(1820)$?
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910698025517056 |
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| author | Molina, R. Liang, Wei-Hong Xiao, Chu-Wen Sun, Zhi-Feng Oset, E. |
| author_facet | Molina, R. Liang, Wei-Hong Xiao, Chu-Wen Sun, Zhi-Feng Oset, E. |
| contents | In this talk, we present a new interpretation for the recently observed $Ξ(1820)$ resonance. We recall that the chiral unitary approach for the interaction of pseudoscalar mesons with the baryons of the decuplet predicts two states for the $Ξ(1820)$ resonance, one with a narrow width and the other one with a large width. We contrast this fact with the recent BESIII measurement of the $K^- Λ$ mass distribution in the $ψ(3686)$ decay to $K^- Λ\barΞ^+ $, which demands a width much larger than the average of the PDG, and show how the consideration of the two $Ξ(1820)$ states provides a natural explanation to this apparent contradiction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_09610 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | One or two poles for the $Ξ(1820)$? Molina, R. Liang, Wei-Hong Xiao, Chu-Wen Sun, Zhi-Feng Oset, E. High Energy Physics - Phenomenology In this talk, we present a new interpretation for the recently observed $Ξ(1820)$ resonance. We recall that the chiral unitary approach for the interaction of pseudoscalar mesons with the baryons of the decuplet predicts two states for the $Ξ(1820)$ resonance, one with a narrow width and the other one with a large width. We contrast this fact with the recent BESIII measurement of the $K^- Λ$ mass distribution in the $ψ(3686)$ decay to $K^- Λ\barΞ^+ $, which demands a width much larger than the average of the PDG, and show how the consideration of the two $Ξ(1820)$ states provides a natural explanation to this apparent contradiction. |
| title | One or two poles for the $Ξ(1820)$? |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2411.09610 |