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Ψ-resonances, gluons and the Zweig rule

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Il Nuovo Cimento A (1965-1970)

Summary

On the basis of the quark-gluon field theory we discuss the dynamical manifestations of gluons in hadron physics. Especially we concentrate on the Zweig rule for meson decays and the decays of the Ψ-resonances. Depending on the various possibilities for the spectrum of the glue mesons, we describe both the glue annihilation and the mixing mechanism for the Zweig-rule-violating meson decays. Furthermore we discuss the break-down of PCAC for the pseudoscalar analogue of the Ψ-meson and the importance of the glue mixing term for the mass spectrum of the pseudoscalar mesons.

Riassunto

Sulla base della teoria dei campi con quark-gluoni si discutono le manifestazioni dinamiche dei gluoni nella fisica degli adroni. Ci si concentra specialmente sulla regola di Zweig per i decadimenti dei mesoni ed i decadimenti delle risonanze Ψ. A seconda delle varie possibilità per lo spettro dei mesoni colla, si descrive sia l’annichilazione della colla sia il meccanismo di mescolanza per i decadimenti mesonici che violano la regola di Zweig. Inoltre si discutono la rottura di PCAC per l’analogo pseudoscalare del mesone Ψ e l’importanza del termine di mescolanza della colla per lo spettro di massa dei mesoni pseudoscalari.

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Work supported in part by the Energy Research and Development Administration. Prepared under Contract AT(11-1)-68 for the San Francisco Operations Office.

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Fritzsch, H., Minkowski, P. Ψ-resonances, gluons and the Zweig rule. Nuov Cim A 30, 393–429 (1975). https://doi.org/10.1007/BF02730295

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