Abstract
I have been asked to give this background talk to the Workshop since the accumulation of data and partial wave analysis of radiative transitions of nucleon resonances gives one of our most important insights into the constituent quark model. Also, one of the topics of the Workshop is the relationship between the constituent quark model and the Melosh transformation and, because of the abundance of data, there has been much phenomenological fitting of the parameters that occur in the simplified version of the Melosh transformation proposed by Gilman, Kugler and Meshkov1) (this version being nearly identical with “ℓ-broken SU(6)w” theory2). Consequently radiative nucleon transitions form an area where one can compare constituent quark model theory and the Melosh-Gilman-Kugler-Meshkov parametrization, leading hopefully to the improvement of both. This talk also deals with radiative transitions with virtual photons, γv + N → N*(coming from the data on e− + N → e− + N + π) where the Melosh transformation is silent but the existing quark model has something to say, partly right and partly wrong.
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References
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© 1977 Plenum Press, New York
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Moorhouse, R.G. (1977). Electromagnetic Transitions of Nucleon Resonances, Constituent Quark Theory, and the Melosh-Gilman-Kugler-Meshkov Parametrization. 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_2
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