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Peer-reviewedCC BY 4.0The European Physical Journal C

Identifying Σ (1380) and Σ (1430) in the J/ψ → Λ π Σ ̅ reaction

  • Wen-Tao Lyu1
  • Eulogio Oset2
  • De-Min Li1
  • En Wang1
  1. 1Zhengzhou University
  2. 2Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna
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Abstract

We study the J/ψ → Λ π Σ ̅ J / ψ → Λ π Σ ¯ reaction by looking at the π + Λ π + Λ mass distribution at low energies, in search of signals for the low lying Σ * Σ ∗ excited states. Apart from a clear signal of the Σ (1385) (3/2+) Σ ( 1385 ) ( 3 / 2 + ) state, we find a smaller peak for the predicted Σ (1430) (1/2-) Σ ( 1430 ) ( 1 / 2 - ) , which has already been confirmed by the Belle Collaboration. A first analysis, considering only the π Λ π Λ interaction, shows that the low energy part of the spectrum is better reproduced including contributions from the Σ (1430) Σ ( 1430 ) and the predicted Σ (1380)(1/2-) Σ ( 1380 ) ( 1 / 2 - ) state that has been claimed before from analyses of different experiments. However, when we consider the π Σ ̅ π Σ ¯ interaction the need for the Σ (1380) Σ ( 1380 ) disappears.

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Cite

BibTeXRIS
BibTeX
@article{lyu2026identifying,
  title = {{Identifying $$\Sigma (1380)$$ and $$\Sigma (1430)$$ in the $$J/\psi \rightarrow \Lambda \pi \bar\Sigma $$ reaction}},
  author = {Wen-Tao Lyu and Eulogio Oset and De-Min Li and En Wang},
  journal = {The European Physical Journal C},
  year = {2026},
  month = oct,
  doi = {10.1140/epjc/s10052-026-16496-0},
  url = {https://link.springer.com/article/10.1140/epjc/s10052-026-16496-0},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Identifying Σ (1380) and Σ (1430) in the J/ψ → Λ π Σ ̅ reaction
AU  - Wen-Tao Lyu
AU  - Eulogio Oset
AU  - De-Min Li
AU  - En Wang
PY  - 2026
DA  - 2026/10/27
JO  - The European Physical Journal C
DO  - 10.1140/epjc/s10052-026-16496-0
UR  - https://link.springer.com/article/10.1140/epjc/s10052-026-16496-0
AB  - We study the J/ψ → Λ π Σ ̅ J / ψ → Λ π Σ ¯ reaction by looking at the π ^+ Λ π + Λ mass distribution at low energies, in search of signals for the low lying Σ ^* Σ ∗ excited states. Apart from a clear signal of the Σ (1385) (3/2^+) Σ ( 1385 ) ( 3 / 2 + ) state, we find a smaller peak for the predicted Σ (1430) (1/2^-) Σ ( 1430 ) ( 1 / 2 - ) , which has already been confirmed by the Belle Collaboration. A first analysis, considering only the π Λ π Λ interaction, shows that the low energy part of the spectrum is better reproduced including contributions from the Σ (1430) Σ ( 1430 ) and the predicted Σ (1380)(1/2^-) Σ ( 1380 ) ( 1 / 2 - ) state that has been claimed before from analyses of different experiments. However, when we consider the π Σ ̅ π Σ ¯ interaction the need for the Σ (1380) Σ ( 1380 ) disappears.
SN  - 1434-6044
SN  - 1434-6052
ER  -