Identifying $$\Sigma (1380)$$ and $$\Sigma (1430)$$ in the $$J/\psi \rightarrow \Lambda \pi \bar{\Sigma }$$ reaction
Year: 2026
Type: article
Abstract: We study the $$J/\psi \rightarrow \Lambda \pi \bar{\Sigma }$$ J / ψ → Λ π Σ ¯ reaction by looking at the $$\pi ^+ \Lambda $$ π + Λ mass distribution at low energies, in search of signals for the low lying $$\Sigma ^*$$ Σ ∗ excited states. Apart from a clear signal of the $$\Sigma (1385) (3/2^+)$$ Σ ( 1385 ) ( 3 / 2 + ) state, we find a smaller peak for the predicted $$\Sigma (1430) (1/2^-)$$ Σ ( 1430 ) ( 1 / 2 - ) , which has already been confirmed by the Belle Collaboration. A first analysis, considering only the $$\pi \Lambda $$ π Λ interaction, shows that the low energy part of the spectrum is better reproduced including contributions from the $$\Sigma (1430)$$ Σ ( 1430 ) and the predicted $$\Sigma (1380)(1/2^-)$$ Σ ( 1380 ) ( 1 / 2 - ) state that has been claimed before from analyses of different experiments. However, when we consider the $$\pi \bar{\Sigma }$$ π Σ ¯ interaction the need for the $$\Sigma (1380)$$ Σ ( 1380 ) disappears.
Source: The European Physical Journal C
Authors: Wen-Tao Lyu, Eulogio Oset, De-Min Li, En Wang
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7167206918