Letter
Open Access

Structure of the $Ω^{-} (2012)$ with Hamiltonian effective field theory

Fang-Chao Han ^1,2,3, Zhan-Wei Liu ^1,2,3,*, Derek B. Leinweber ^4,†, and Anthony W. Thomas ^4,‡

¹School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
²Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China
³Lanzhou Center for Theoretical Physics, MoE Frontiers Science Center for Rare Isotopes, Key Laboratory of Quantum Theory and Applications of MoE, Key Laboratory of Theoretical Physics of Gansu Province, Gansu Provincial Research Center for Basic Disciplines of Quantum Physics, Lanzhou University, Lanzhou 730000, China
⁴CSSM, Department of Physics, University of Adelaide, Adelaide, South Australia 5005, Australia

^*Contact author: liuzhanwei@lzu.edu.cn
^†Contact author: derek.leinweber@adelaide.edu.au
^‡Contact author: anthony.thomas@adelaide.edu.au

Phys. Rev. D 112, L051503 – Published 29 September, 2025

DOI: https://doi.org/10.1103/xdbd-v5hb

Abstract

We investigate the internal structure of the $Ω (2012)^{-}$ by analyzing lattice QCD simulation and experimental data within Hamiltonian effective field theory, considering both $J^{P} = 1 / 2^{-}$ and $3 / 2^{-}$ assignments. The couplings to the dominant decay channel $Ξ \bar{K}$ and the near-threshold channel $Ξ (1530) \bar{K}$ are determined through the quark-pair-creation model. By studying the lattice QCD spectra in these two spin-parity scenarios, we extract the masses and widths of the resonances. We notice that the $J^{P} = 3 / 2^{-}$ resonance is consistent with the observed $Ω (2012)^{-}$ while the recently reported $Ω (2109)^{-}$ may be a $J^{P} = 1 / 2^{-}$ $Ω$ .

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Phys. Rev. D 112, L051503– Published 29 September, 2025

Vol. 112, Iss. 5 — 1 September 2025

Received 10 July 2025
Accepted 9 September 2025

DOI: https://doi.org/10.1103/xdbd-v5hb

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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Structure of the $Ω^{-} (2012)$ with Hamiltonian effective field theory

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Structure of the Ω−(2012) with Hamiltonian effective field theory

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References (84)

Structure of the $Ω^{-} (2012)$ with Hamiltonian effective field theory