Abstract

We provide a formulation of generalized vector dominance (GVD) for low–x deep-inelastic scat- tering that explicitly incorporates the gamma^{*} → q {bar q} transition and a QCD-inspired ansatz for the (q q )p forward-scattering amplitude. The destructive interference originally introduced in off-diagonal GVD is recovered in the present formulation and traced back to the generic structure of two-gluon-exchange as incorporated into the notion of colour transparency. Asymptotically, the transverse photoabsorption cross section be- haves as (ln Q2 )/Q2 , implying a logarithmic violation of scaling for F2 , while the longitudinal-to-transverse ratio decreases as 1/ ln Q2 .