Deep inelastic scattering and "elastic" diffraction

Abstract

We examine the total cross section of virtual photons on protons, ${\sigma }_{{\gamma }^{\ast }p}(W^2,Q^2)$, at low $x\cong Q^2/W^2\ll 1$ and its connection with ``elastic'' diffractive production ${\gamma }_{T,L}^{\ast }p\to X_{T,L}^{J=1}p$ in the two-gluon exchange dynamics for the virtual forward Compton scattering amplitude. Solely based on the generic structure of two-gluon exchange, we establish that the cross section is described by the (imaginary part of the) amplitude for forward scattering of $q\bar{q}$ vector states, $(q\bar{q}{)}_{T,L}^{J=1}p\to (q\bar{q}{)}_{T,L}^{J=1}p$. The generalized vector dominance/color dipole picture (GVD/CDP) is accordingly established to only rest on the two-gluon-exchange generic structure. This is explicitly seen by the sum rules that allow one to directly relate the total cross section to the cross section for elastic diffractive forward production, ${\gamma }_{T,L}^{\ast }p\to (q\bar{q}{)}_{T,L}^{J=1}p$, of vector states.

24 pages, latex file with three eps figures. BI-TP 2002/21

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Cited by in corpus (8)

• Diffractive Vector Meson Production at HERA: from Soft to Hard QCD
• The Color Dipole Picture of low-x DIS: Model-Independent and Model-Dependent Results
• The Color Dipole Picture and the ratio of R(W, Q) = sigma L/sigma T
• Color Dipole Picture of Deep Inelastic Scattering, Revisited
• The energy dependence of the saturation scale in DIS at low x
• J/Psi photo- and electroproduction, the saturation scale and the gluon structure function
• The total virtual photoabsorption cross section, deeply virtual Compton scattering and vector-meson production
• Unique Prediction for High-Energy J/ψPhotoproduction: Color Transparency and Saturation