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arXiv · hep-ph/9910379

Off-diagonal generalized vector dominance in DIS and QCD

G. Cvetic·D. Schildknecht·A. Shoshi
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Abstract

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 qbar transition and a QCD-inspired ansatz for the (qqbar)p scattering amplitude. The destructive interference, originally introduced in off-diagonal GVD is traced back to the generic strcuture of two-gluon exchange. Asymptotically, the transverse photoabsorption cross section behaves as (ln Q^2)/Q^2, implying a logarithmic violation of scaling for F_2, while the longitudinal-to-transverse ratio decreases as 1/\ln Q^2. We also briefly comment on vector-meson production.

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G. Cvetic, D. Schildknecht, A. Shoshi. 1999-10-18. Off-diagonal generalized vector dominance in DIS and QCD. https://arxiv.org/abs/hep-ph/9910379

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