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Strangeness in the proton and N*(1535)

B. S. Zou
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Abstract

The newest progress on the study of the strangeness in the proton and in the lowest negative parity nucleon excited state $N^*(1535)$ is reviewed. Implications on the internal quark structure of the proton, $N^*(1535)$ and other baryons are discussed. The diquark cluster picture for the 5-quark components in baryons gives a natural explanation not only to the empirical indications for a positive strangeness magnetic moment $μ_s$ and positive strangeness radius of the proton but also the longstanding mass-reverse problem of $N^*(1535)$, $N^*(1440)$ and $Λ^*(1405)$ resonances as well as the unusual decay pattern of the $N^*(1535)$ resonance. Evidence for possible existence of $N^*(1535)$'s ${1/2}^-$ SU(3) nonet partners in this picture is pointed out, and suggestion is made to search for these $1/2^-$ hyperon excited states under the well known $Σ^*(1385)$, $Λ^*(1520)$ and $Ξ^*(1530)$ peaks in various reactions.

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B. S. Zou. 2006-10-15. Strangeness in the proton and N*(1535). https://doi.org/10.1016/j.nuclphysa.2007.03.158

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