We discuss a possible scheme of introducing electromagnetic currents in the dual-resonance model in such a way as to maintain duality in many-photon amplitudes. It turns out that the currents build up a pair of trajectories (Pomeranchukon-like and photon-like) with intercept one. A more specific ansatz for the current vertex gives generalized ρ -dominance form factors and a scaling behavior of the inelastic structure function π.
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Y. Nambu (1971) studied this question.
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