Theη-baryon octet

Abstract

The recent tantalizing experimental support for an $\ensuremath{\eta}$-baryon ${J}^{P}={\frac{1}{2}}^{\ensuremath{-}}$ unmixed octet challenges conventional model wisdom. The establishment of the $\ensuremath{\Xi}(1868)$ member of the $\ensuremath{\eta}$ octet will give strong affirmation that the negative-parity baryon mass spectrum could be mixing-free.

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