Off-diagonal generalized vector dominance in DIS and QCD

Cvetic G, Schildknecht D, Shoshi A. Off-diagonal generalized vector dominance in DIS and QCD. ACTA PHYSICA POLONICA B. 1999;30(11):3265-3284.We review the generalized vector dominance (GVD) approach to DIS at small values of the scaling variable, x. In particular, we concentrate on a recent formulation of GVD that explicitly incorporates the configuration of the gamma* --> q(q)overbar transition and a QCD-inspired ansatz for the (q(q)overbar)p scattering amplitude. The destructive interference, originally introduced in off-diagonal GVD is traced back to the generic structure of two-gluon exchange. Asymptotically, the transverse photoabsorption cross section behaves as (In Q(2))/Q(2), implying a logarithmic violation of scaling for F-2, while the longitudinal-to-transverse ratio decreases as 1/lnQ(2). We also briefly comment on vector-meson production