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Radiative decays of the Λ(1520) as a dynamically generated resonance

Rui-Xiang Shi1,2, Yu-Bao Zhang1,2, Jun-Xu Lu3,*, Chun-Yan Song3,†, and Li-Sheng Geng3,4,5,6,‡

  • *Contact author: ljxwohool@buaa.edu.cn
  • †Contact author: cysong@buaa.edu.cn
  • ‡Contact author: lisheng.geng@buaa.edu.cn
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Phys. Rev. D 114, 056012 – Published 10 September, 2026

DOI: https://doi.org/10.1103/5pq8-dh92

Abstract

Inspired by the latest BESIII measurement of the Λ(1520)→γΣ0 radiative decay, we systematically study the decays Λ(1520)→γΛ(Σ0) 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)→γΣ0) agrees well with the new BESIII data, whereas the predicted Γ(Λ(1520)→γΛ) is considerably smaller than the CLAS experimental result. By comparing our results with predictions from various quark models, together with an analysis of the Λ(1520) compositeness, 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.

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Phys. Rev. D 114, 056012– Published 10 September, 2026
  • Received 17 May 2026
  • Accepted 10 August 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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