Review of the Low-Lying Excited Baryons Σ*(1/2<sup>−</sup>)
En Wang, Li‐Sheng Geng, Jia-Jun Wu, Ju-Jun Xie, B. S. Zou
Abstract
Abstract Strong empirical and phenomenological indications exist for large sea-quark admixtures in the low-lying excited baryons. Investigating the low-lying excited baryon Σ * (1/2 − ) is important for determining the nature of the low-lying excited baryons. We review the experimental and theoretical progress on the studies of the Σ * (1/2 − ). Although several candidates have received intensive discussions, such as Σ (1620) and Σ (1480), their existence needs further confirmation. Following the prediction of the unquenched quark models for the Σ * (1/2 − ), many theoretical works suggested the existence of these states in various processes. Future experimental measurements could shed light on the existence of the low-lying excited Σ * (1/2 − ) state.