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Is there a vector-dominance frame problem?

par Mannheim, Philippe
Référence Physical Review D - Particles, Fields, Gravitation and Cosmology, 3, 11, page (2840-2847)
Publication Publié, 1971

Article révisé par les pairs

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Résumé :

We argue that it is not meaningful to discuss the vector-dominance model using the language of longitudinal projections. We find that a more suitable language for vector dominance is in terms of electric and magnetic couplings rather than in terms of longitudinal and transverse ones. We advocate the use only of the off-shell invariant amplitudes ("Ball amplitudes"). The experimental failure of the model for polarized photoproduction of pions then implies either that some of the Ball amplitudes require subtractions in k2, the mass of the current, or that states other than ρ, ω, and Ï also couple to the electromagnetic current. © 1971 The American Physical Society.