Summary
The photon momentum dependence is brought into photon-vector-meson coupling strengths by taking account of the contribution of the intermediate quark-antiquark state. The data on cross-sections for photoproductions and leptonic widths of vector mesons, cross-sections for ψ production by off-shell photons and the pion form factor can be reproduced simultaneously by using the coupling strengths with the photon momentum dependence.
Riassunto
Si introduce una dipendenza dell’impulso del fotone nelle ampiezze dell’accoppiamento fotone-mesone vettoriale tenendo conto del contributo dello stato intermedio quark-antiquark. I dati sulle sezioni d’urto per la fotoproduzione e le ampiezze leptoniche dei mesoni vettoriali, le sezioni d’urto per la produzione di ψ mediante fotoni all’esterno dello strato e il fattore di forma del pione si possono riprodurre simultaneamente mediante le ampiezze di accoppiamento con la dipendenza dall’impulso del fotone.
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Terasaki, K. Vector-meson dominance with photon-vector-meson coupling strengths dependent on the photon momentum squared. Nuov Cim A 66, 475–484 (1981). https://doi.org/10.1007/BF02730368
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DOI: https://doi.org/10.1007/BF02730368