Saturation in DIS at low x

Saturation at low x appears as an almost unaboidable consequence of the two-gluon excange generic structure.Comment: 3 pages, espcrc2.sty, Presented at Diffraction 2004, Cala Conone, Ital

The γ∗p\gamma^* p total cross section and elastic diffraction

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.Comment: 4 pages, Latex using espcrc2.sty, 1 figure using 1 eps file. Presented at QCD2002, Montpellier, France, July 200

Low x Inelastic Electron Scattering From Generalized Vector Dominance

It is shown that the HERA experimental data on deep inelastic scattering at low values of the scaling variable x < 0.05 are in good agreement with predictions from Generalized Vector Dominance in the full kinematic range from Q2 = 0 (photoproduction) to Q2 = 350 GeV.Comment: 8 pages, 2 figures, other comment

Low x_{bj} DIS, QCD and Generalized Vector Dominance

We give a brief overview on the present status of Generalized Vector Dominance as appplied to vector-meson production and the total photoabsorption cross section in the region of small x_{bj}. We comment on how GVD originates from QCD notions such as color transparency.Comment: 5 pages, latex, 2 postscript figure

The Color Dipole Picture

We give a brief exposition of the color dipole picture of deep inelastic scattering.Comment: Presented at Diffraction 2012, Lanzarote, Canary Islands (Spain), September 10-15, 2012 (Proceedings to appear

Experimental Evidence for Electroweak Corrections Beyond Fermion Loops

We reemphasize the importance of discriminating fermion-loop and bosonic electroweak corrections in the analysis of electroweak precision data. Most recent data are indeed precise enough to require corrections beyond (trivial) fermion loops. An analysis of these data in terms of the observables $\Delta x \equiv \epsilon_{N1} - \epsilon_{N2}$, $\Delta y \equiv - \epsilon_{N2}$ and $\epsilon \equiv - \epsilon_{N3}$ identifies the required additional corrections as vertex corrections at the $W^\pm f\bar f^\prime$ and $Z^0 f\bar f$ vertices. Standard-model values for these corrections are consistent with the experimental data.Comment: Presented at the XXIXth Rencontres de Moriond, March 1994., 4pages uuencoded postscript file, BI-TP 94/1