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

Abstract

From recent study of properties of the lowest spin-parity $1/2^{-}$ baryons, $N^{\ast }(1535)$ and ${\Delta }^{\ast }(1620)$, 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.

Comments: for Proceedings of NSTAR07 at Bonn, Germany