J-dependence of the twist parameter in dual unitarity

Abstract

It is pointed out that the twist parameter which governs the breaking of exchange degeneracy, Zweig rule violation, exotic exchange, and the relative production of vector and tensor mesons, is J-dependent. A simple model for this dependence reconciles the smallness of exotic exchange with the large ratio of vector to tensor production, and' successfully predicts the sign and magnitude of a (o)-a A (o) p .