Review of the Low-Lying Excited Baryons Σ*(1/2⁻)

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.