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Quarks and Hadronic Structure pp 93–136Cite as

Current and Constituent Quarks: Theory and Practice

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Part of the book series: International Physics Workshop Series ((IPWS,volume 1))

Abstract

The present status of SU(6)W phenomenology is surveyed in detail. After a discussion of SU(6) multiplets in the baryon and meson spectra, some ideas underlying the construction of SU(6)W decay models are reviewed. In particular, the approach to SU(6)W invoking the Melosh transformation between current and constituent quarks is described, and also, more briefly, explicit harmonic oscillator quark model calculations. The relative successes of the predictions of these two approaches for both baryon and meson decays are discussed at length. Some interesting suggestions emerge concerning the missing meson multiplets.

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References and Footnotes

  1. For more extensive discussion of the constituent quark model, together with a more complete set of references than can be given here, the reader is referred to the reviews by H.J. Lipkin (Phys. Reports C8 (1973)). J. Rosner (Physics Reports C11 (1974) and J. Weyers, Lectures at 1973 Louvain Summer School.

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  54. It is crucial for P.T. Mathews and G. Feldman, I.C. Preprint 1975, who have invoked such a factor to suppress photon decays of coloured states in a colour model for the new particles. This is clearly a large and speculative extrapolation of this factor from its present domain of validity.

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  55. Further discussion is contained in Ref. 27. I am grateful to John Ellis of CERN and Potters Bar Institute of Technology for emphasizing this point.

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  56. The possibility of mixing is ignored in this “first approximation” analysis.

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  57. There are indications from pp annihilation into 1+ir via the 1 channel that pe may be important. However, since the p’(l.6) is well below threshold for this experiment it is difficult to make any definitive statements concerning resonance branching ratios. I am grateful to Lucien Montanet for informing of the pp analysis.

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  58. One can ‘explain’ these narrow widths for radial excitations by an othogonality argument for Hπ sandwiched between L=0 states. It is still surprising, however, that this remains valid to quite large Q values in the decay. We are grateful to Professor Feynman for some stimulating discussions concerning this point.

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Authors and Affiliations

  1. Physics Department, Southampton University, UK

    A. J. G. Hey

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Editors and Affiliations

  1. Istituto di Fisica dell’Università, Genova, Italy

    G. Morpurgo

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© 1977 Plenum Press, New York

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Hey, A.J.G. (1977). Current and Constituent Quarks: Theory and Practice. In: Morpurgo, G. (eds) Quarks and Hadronic Structure. International Physics Workshop Series, vol 1. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-0928-4_5

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  • DOI: https://doi.org/10.1007/978-1-4684-0928-4_5

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