Abstract
The single-particle approximation implies the vanishing of all moments of scattering amplitudes which are exotic in thet-channel. These conditions are shown to be consistent with a class of amplitudes which do not identically vanish. A special class of such amplitudes is that of Veneziano. When supplemented by the Adler condition in the presence of a soft pion, such amplitudes do vanish periodically int and give rise to mass quantization conditions. Contact is made with the current-algebraic approach used in a previous work.
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