Abstract
Asymptotic SU(4) symmetry is imposed on generalised vector dominance models with off-diagonal terms, relating the magnitudes of these terms in the various sectors V = ϱ, ω, φ, ψ. While the structure functions are modified, their ratios remain similar to those of the diagonal model. Strangeness and charm production are suppressed for low Q 2 < M φ 2, M ψ 2 respectively.
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