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

Electroweak Theory and the 1996/97 Precision Electroweak Data

We review the empirical evidence for the validity of the Standard Electroweak Theory in Nature. The experimental data are interpreted in terms of an effective Lagrangian for Z physics, allowing for potential sources of SU(2) violation and containing the predictions of the Standard Electroweak Theory as a special case. Particular emphasis is put on discriminating loop corrections due to fermion-loop vector-boson propagator corrections on the one hand, from corrections depending on the non-Abelian structure and the Higgs sector on the other hand. Results from recently obtained fits of the Higgs-boson mass are reported, yielding M_H < 430 GeV [680 GeV] at 95% C.L. based on the input of \swbar^2(\LEP+\SLD)_{`97} = 0.23152 +- 0.00023 [\swbar^2(\LEP)_{`97} = 0.23196 +- 0.00028]. The LEP2 data provide first direct experimental evidence for non-zero non-Abelian couplings among the electroweak vector bosons.Comment: 22 pages, Latex, 8 figures in 13 ps-files and appb.sty include

On the Energy Dependence of DIS in the Diffraction Region of Low X

The energy dependence of the virtual photoabsorption cross section in deep inelastic scattering (DIS) at low $x = Q^2/W^2 < 0.1$ may be described in terms of the saturation scale that in our approach depends on the energy, $\Lambda^2_{sat} = \Lambda^2_{sat} (W^2)$. We briefly summarize our recent findings that allow us to predict the exponent $C_2$ of $\Lambda^2_{sat} (W^2) \sim (W^2)^{C_2}$ in agreement with the previous result obtained from fitting the experimental data. The exponent $C_2$ depending on the relative magnitude of the longitudinal and transverse contribution to the structure function, direct measurements of the longitudinal part are urgently needed.Comment: To appear in the proceedings of the XIth International Conference on Elastic and Diffractive Scattering Chateau de Blois, France, May 15-20, 200

DIS at low x, saturation scale, gluon structure function and vector-meson production

Deep inelastic scattering at low x can be described by essentially only two fitted parameters. The interpretation of J/Psi photoproduction in terms of the gluon structure function is elaborated upon.Comment: Talk at 41st Rencontres de Moriond, March 2006, 4 pages with 2 figure

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