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The role of triangle singularity in isospin breaking process $J/\psi \to \Lambda \bar{\Lambda} \pi$ and the possible evidence of $\Sigma^*(\frac{1}{2}^-)$ states
In this study, the impact of triangle singularity is investigated in the isospin-breaking process $J/\psi \to \Lambda \bar{\Lambda} \pi$. The triangle singularity is found to play a significant role in the process, resulting in the creation of a resonance-like structure around 1.4 GeV in the $\Lambda\pi(\bar{\Lambda}\pi)$ invariant mass spectrum. To …