Strangeness in the proton and N*(1535)

Abstract

The newest progress on the study of the strangeness in the proton and in the lowest negative parity nucleon excited state $N^{\ast }(1535)$ is reviewed. Implications on the internal quark structure of the proton, $N^{\ast }(1535)$ 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 ${\mu }_s$ and positive strangeness radius of the proton but also the longstanding mass-reverse problem of $N^{\ast }(1535)$, $N^{\ast }(1440)$ and ${\Lambda }^{\ast }(1405)$ resonances as well as the unusual decay pattern of the $N^{\ast }(1535)$ resonance. Evidence for possible existence of $N^{\ast }(1535)$'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 ${\Sigma }^{\ast }(1385)$, ${\Lambda }^{\ast }(1520)$ and ${\Xi }^{\ast }(1530)$ peaks in various reactions.

6 pages, 2 figures, Plenary talk at 18th International IUPAP Conference on Few-Body Problems in Physics August 21-26. 2006 Santos SP Brazil; to be published in Nuclear Physics A

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Cited by in corpus (9)

• On the nature of the lowest $1/2^{-}$ baryon nonet and decuplet
• Role of vector and pseudoscalar mesons in understanding $1/2^{-}$ $N^{\ast }$ and $\Delta$ resonances
• Five-quark components in baryons
• Study of $\eta$ photoproduction on the proton in a chiral constituent quark approach via one-gluon-exchange model
• Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV
• Combined study of gamma p to eta p and pi-p to eta n in a chiral constituent quark approach
• The Octet Meson and Octet Baryon Interaction with strangeness and the $\Lambda (1405)$
• Combined analysis of the ${\pi }^{-}p\to K^0\Lambda$, $\eta n$ reactions in a chiral quark model
• Spectrum and Structure of Excited Baryons with CLAS