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  • Letter
  • Open Access

Quantum numbers of the X(1880)

Qin-He Yang1,2,3, Ling-Yun Dai1,4,*, and Ulf-G. Meißner2,3,5,†

  • 1School for Theoretical Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China
  • 2Helmholtz Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany
  • 3Institute for Advanced Simulation (IAS-4), Forschungszentrum Jülich, D-52425 Jülich, Germany
  • 4Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications, Hunan University, Changsha 410082, China
  • 5Peng Huanwu Collaborative Center for Research and Education, International Institute for Interdisciplinary and Frontiers, Beihang University, Beijing 100191, China

  • *Contact author: dailingyun@hnu.edu.cn
  • †Contact author: meissner@hiskp.uni-bonn.de
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Phys. Rev. D 113, L011501 – Published 9 January, 2026

DOI: https://doi.org/10.1103/gmyw-cfjf

Abstract

We study the properties of the X(1880), the structure around the p¯p threshold that appears in the 3(π+π−) invariant mass spectrum in the decay process of J/ψ→γ3(π+π−). Nucleon-antinucleon rescattering is taken into account in our analysis, and the decay amplitude of J/ψ→γ3(π+π−) can be obtained by the distorted wave Born approximation. With these amplitudes, we analyze the contributions to the X(1880) from different partial waves. Our analysis suggests that the X(1880) should be isoscalar 0−+, and it is generated by the threshold behavior.

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Phys. Rev. D 113, L011501– Published 9 January, 2026
  • Received 11 December 2024
  • Accepted 22 December 2025
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