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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.14946 |
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| _version_ | 1866909043925188608 |
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| author | Shi, Rui-Xiang Zhang, Yu-Bao Lu, Jun-Xu Song, Chun-Yan Geng, Li-Sheng |
| author_facet | Shi, Rui-Xiang Zhang, Yu-Bao Lu, Jun-Xu Song, Chun-Yan Geng, Li-Sheng |
| contents | Inspired by the latest BESIII measurement of the $Λ(1520)\toγΣ^0$ radiative decay, we systematically study the decays $Λ(1520)\toγΛ(Σ^0)$ within the chiral unitary approach, where the $Λ(1520)$ is treated as a dynamically generated resonance from meson-baryon interactions. Compared with previous chiral unitary studies, we adopt dimensional regularization for $S$-wave loop integrals to preserve gauge invariance and, for the first time, include Feynman diagrams with photon coupling to intermediate baryons. Our calculated partial decay width $Γ(Λ(1520)\toγΣ^0)$ agrees well with the new BESIII data, whereas the predicted $Γ(Λ(1520)\toγΛ)$ is considerably smaller than the CLAS experimental result. By comparing our results with predictions from various quark models, we discuss the internal nature of the $Λ(1520)$ resonance, highlight its complex component structure, and stress the need for more refined theoretical frameworks and further experimental measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_14946 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Radiative decays of the $Λ(1520)$ as a dynamically generated resonance Shi, Rui-Xiang Zhang, Yu-Bao Lu, Jun-Xu Song, Chun-Yan Geng, Li-Sheng High Energy Physics - Phenomenology Inspired by the latest BESIII measurement of the $Λ(1520)\toγΣ^0$ radiative decay, we systematically study the decays $Λ(1520)\toγΛ(Σ^0)$ within the chiral unitary approach, where the $Λ(1520)$ is treated as a dynamically generated resonance from meson-baryon interactions. Compared with previous chiral unitary studies, we adopt dimensional regularization for $S$-wave loop integrals to preserve gauge invariance and, for the first time, include Feynman diagrams with photon coupling to intermediate baryons. Our calculated partial decay width $Γ(Λ(1520)\toγΣ^0)$ agrees well with the new BESIII data, whereas the predicted $Γ(Λ(1520)\toγΛ)$ is considerably smaller than the CLAS experimental result. By comparing our results with predictions from various quark models, we discuss the internal nature of the $Λ(1520)$ resonance, highlight its complex component structure, and stress the need for more refined theoretical frameworks and further experimental measurements. |
| title | Radiative decays of the $Λ(1520)$ as a dynamically generated resonance |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.14946 |