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Radiative decays of the Ω(2012) as a hadronic molecule

Qing-Hua Shen1,2,3,*, Jun-Xu Lu4,†, Li-Sheng Geng4,5,6,7,8,‡, Xiang Liu2,9,10,11,§, and Ju-Jun Xie1,3,8,∥

  • 1State Key Laboratory of Heavy Ion Science and Technology, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 3School of Nuclear Sciences and Technology, University of Chinese Academy of Sciences, Beijing 101408, China
  • 4School of Physics, Beihang University, Beijing 102206, China
  • 5Sino-French Carbon Neutrality Research Center, Ecole Centrale de Pekin/School of General Engineering, Beihang University, Beijing 100191, China
  • 6Peng Huanwu Collaborative Center for Research and Education, International Institute for Interdisciplinary and Frontiers, Beihang University, Beijing 100191, China
  • 7Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 102206, China
  • 8Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences, Huizhou 516000, China
  • 9Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Key Laboratory of Quantum Theory and Applications of MoE, Gansu Provincial Research Center for Basic Disciplines of Quantum Physics, Lanzhou University, Lanzhou 730000, China
  • 10MoE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China
  • 11Research Center for Hadron and CSR Physics, Lanzhou University & Institute of Modern Physics of CAS, Lanzhou 730000, China

  • *Contact author: shenqinghua@impcas.ac.cn
  • †Contact author: ljxwohool@buaa.edu.cn
  • ‡Contact author: lisheng.geng@buaa.edu.cn
  • §Contact author: xiangliu@lzu.edu.cn
  • ∥Contact author: xiejujun@impcas.ac.cn
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Phys. Rev. D 113, 036014 – Published 13 February, 2026

DOI: https://doi.org/10.1103/y55h-83hg

Abstract

We present a theoretical investigation of the radiative decay process Ω(2012)→γΩ, where the Ω(2012) resonance with spin-parity JP=32− is treated as a dynamically generated state from K¯Ξ(1530) and ηΩ in s-wave and K¯Ξ in d-wave. The radiative decay width of the Ω(2012) is calculated using a triangular loop mechanism, where the Ω(2012) couples to the K¯Ξ(1530) channel. Subsequently, the final-state interactions between Ξ(1530) and K¯ transition to a photon and Ω through the exchange of a Ξ baryon. Our calculations yield a radiative decay width of 13.2−5.6+4.5  keV, with uncertainties arising from the model parameters. This result provides valuable insights into the nature of the Ω(2012) resonance and its decay dynamics. It is expected that the calculations presented here could be verified by future experiments, which would open a new door for studying the still elusive nature of Ω(2012).

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Phys. Rev. D 113, 036014– Published 13 February, 2026
  • Received 21 October 2025
  • Accepted 16 January 2026
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