The $γ^* p$ total cross section and elastic diffraction

Details The $γ^* p$ total cross section and elastic diffraction The $γ^* p$ total cross section and elastic diffraction

2002-09-30

arxiv.org/abs/hep-ph/0209369v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, Latex using espcrc2.sty, 1 figure using 1 eps file. Presented at QCD2002, Montpellier, France, July 2002

Scientific paper

10.1016/S0920-5632(03)01835-8

The empirical scaling law, wherein the total photoabsorption cross section depends on the single variable $\eta=(Q^2 + m^2_0)/\Lambda^2 (W^2)$, provides empirical evidence for saturation in the sense of $\sigma_{\gamma^* p} (W^2, Q^2) / \sigma_{\gamma p} (W^2) \to 1$ for $W^2 \to \infty$ at fixed $Q^2$. The total photoabsorption cross section is related to elastic diffraction in terms of a sum rule. The excess of diffractive production over the elastic component is due to inelastic diffraction that contains the production of hadronic states of higher spins. Motivated by the diffractive mass spectrum, the generalized vector dominance/color dipole picture (GVD/CDP) is extended to successfully describe the DIS data in the full region of $x \le 0.1$, all $Q^2 \ge 0$, where the diffractive two-gluon-exchange mechanism dominates.

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