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Particles and Fields

Eur. Phys. J. C 20, 77-91
DOI: 10.1007/s100520100650

The generalised vector dominance/colour-dipole picture of deep-inelastic scattering at low x

G. Cvetic1, D. Schildknecht2, B. Surrow3 and M. Tentyukov2

1  Department of Physics, Universidad Técnica Federico Santa María, Valparaíso, Chile
2  Fakultät für Physik, Universität Bielefeld, 33501 Bielefeld, Germany
3  DESY, 22607 Hamburg, Germany

(Received: 16 February 2001 / Published online: 3 May 2001 -© Springer-Verlag / Società Italiana di Fisica 2001)

We give a detailed account of the recently formulated generalised vector dominan ce/co lour-dipole picture (GVD/CDP) of deep-inelastic scattering at low $x\cong Q^2/W^2$, including photoproduction. The approach, based on $\gamma^*
(q \bar q)$ transitions, $q \bar q$ propagation and diffractive $(q \bar q)
p$ scattering via the generic structure of the two-gluon exchange, provides a unique and quantitatively successful theory for the $\gamma^* p$ total cross section, $\sigma_{\gamma^* p} (W^2,Q^2)$, at low x. The GVD/CDP is shown to imply the empirical low-x scaling law, $\sigma_{\gamma^* p} (W^2,Q^2)=\sigma_{\gamma^* p} (\eta)$ with $\eta=(Q^2+m_0^2)/\Lambda^2(W^2)$, that was established by a model-independent analysis of the experimental data.

© Società Italiana di Fisica, Springer-Verlag 2001