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PreprintCC BY 4.0arXiv

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

  • Wen-Tao Lyu
  • Eulogio Oset
  • De-Min Li
  • En Wang
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Abstract

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

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Cite

BibTeXRIS
BibTeX
@misc{lyu2026identifying,
  title = {{Identifying $Σ(1380)$ and $Σ(1430)$ in the $J/ψ\to Λπ\barΣ$ reaction}},
  author = {Wen-Tao Lyu and Eulogio Oset and De-Min Li and En Wang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2607.02485},
  eprint = {2607.02485},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.02485},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Identifying Σ(1380) and Σ(1430) in the J/ψ→ ΛπΣ̅ reaction
AU  - Wen-Tao Lyu
AU  - Eulogio Oset
AU  - De-Min Li
AU  - En Wang
PY  - 2026
DA  - 2026/10/28
PB  - arXiv
DO  - 10.48550/arxiv.2607.02485
UR  - https://arxiv.org/abs/2607.02485
AB  - We study the J/ψ→ ΛπΣ̅ reaction by looking at the π^+ Λ mass distribution at low energies, in search of signals for the low lying Σ^+ excited states. Apart from a clear signal of the Σ(1385) (3/2^+) state, we find a smaller peak for the predicted Σ(1430) (1/2^-), which has already been confirmed by the Belle Collaboration. A first analysis, considering only the πΛ interaction, shows that the low energy part of the spectrum is better reproduced including contributions from the Σ(1430) and the predicted Σ(1380)(1/2^-) state that has been claimed before from analyses of different experiments. However, when we consider the πΣ̅ interaction the need for the Σ(1380) disappears.
ER  -