Review of the low-lying excited baryons ${\Sigma }^{\ast }(1/2^{-})$

Abstract

Strong empirical and phenomenological indications exist for large sea-quark admixtures in the low-lying excited baryons. Investigating the low-lying excited baryon ${\Sigma }^{\ast }(1/2^{-})$ is important to determine the nature of the low-lying excited baryons. We review the experimental and theoretical progress on the studies of the ${\Sigma }^{\ast }(1/2^{-})$. Although several candidates have received intensive discussions, such as $\Sigma (1620)$ and $\Sigma (1480)$, their existence needs further confirmation. Following the prediction of the unquenched quark models for the ${\Sigma }^{\ast }(1/2^{-})$, 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 ${\Sigma }^{\ast }(1/2^{-})$ state.

9 pages, 2 figures, the version of publication in Chinese Physics Letters

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• Partial wave analysis of $\psi (3686)\to \Lambda {\bar{\Sigma }}^0{\pi }^0+c.c.$
• Role of $\Xi (1690)$ in the $J/\psi \to {\Xi }^0\bar{\Lambda }{K}^0$ reaction
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