Radiative decays of the Λ(1520) as a dynamically generated resonance
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.
Related
- Nonleptonic decays of the double-charmed baryon Ξcc+ with dynamically determined baryon wave functions
- Radiative and Dalitz decays of Υ(1S) in the light of the ATOMKI X17 anomaly
- Long-Distance Contributions to Light Vector Mesons and Radiative Decays of ηc
- Next-to-leading order QCD corrections to fully charm tetraquark radiative decays
- Extraction of charmonium branching fractions from J/ψ→γηc radiative decays
BibTeX
@misc{shi2026radiative,
title = {{Radiative decays of the $Λ(1520)$ as a dynamically generated resonance}},
author = {Rui-Xiang Shi and Yu-Bao Zhang and Jun-Xu Lu and Chun-Yan Song and Li-Sheng Geng},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2605.14946},
eprint = {2605.14946},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.14946},
}
RIS
TY - UNPB
TI - Radiative decays of the Λ(1520) as a dynamically generated resonance
AU - Rui-Xiang Shi
AU - Yu-Bao Zhang
AU - Jun-Xu Lu
AU - Chun-Yan Song
AU - Li-Sheng Geng
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2605.14946
UR - https://arxiv.org/abs/2605.14946
AB - Inspired by the latest BESIII measurement of the Λ(1520)→γΣ^0 radiative decay, we systematically study the decays Λ(1520)→γΛ(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)→γΣ^0) 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.
ER -