On the nature of the lowest $1/2^-$ baryon nonet and decuplet

TL;DR

This paper proposes new internal structure models for the lowest $1/2^-$ baryon octet and decuplet, suggesting diquark-diquark-antiquark and vector-meson-baryon components, supported by recent property studies and experimental predictions.

Contribution

It introduces novel structural models for the lowest $1/2^-$ baryons, emphasizing diquark and vector-meson components, with experimental detection strategies.

Findings

Evidence for diquark-diquark-antiquark structure in octet baryons.

Proposed vector-meson-baryon components in decuplet baryons.

Predictions for missing baryon states and experimental detection methods.

Abstract

From recent study of properties of the lowest spin-parity $1/2^-$ baryons, $N^*(1535)$ and $\Delta^*(1620)$, new pictures for the internal structure of the lowest $1/2^-$ baryon octet and decuplet are proposed. While the lowest $1/2^-$ baryon octet may have large diquark-diquark-antiquark component, the lowest $1/2^-$ baryon decuplet is proposed to have large vector-meson-baryon components. Evidence for the "missing" members of the new pictures is pointed out and suggestions are made for detecting these predicted states from forthcoming experiments.