Low $Q^2$, Low $x$ Region in Electroproduction $-$ an Overview

Abstract

We summarise existing experimental and theoretical knowledge on the structure function $F_2$ in the region of low $Q^2$ and low $x$. The constraints on the behaviour of structure functions in the limit $Q^2=0$ are listed. Phenomenological low $Q^2$ parametrisations of the $F_2$ are collected and their dynamical content is discussed. The high energy photoproduction and nuclear shadowing are also briefly described. Recent update of the low $Q^2$, low $x$ experimental data is given.

28 pages Warsaw university preprint number IFD/1/1994

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• Total cross sections
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• A Measurement of the Proton Structure Function F_2(x,Q^2) at Low x and Low Q^2 at HERA
• Observation of a Coherence Length Effect in Exclusive Rho^0 Electroproduction
• Proton polarizability effect in the Lamb shift of the hydrogen atom
• Inclusive Measurements of Inelastic Electron and Positron Scattering from Unpolarized Hydrogen and Deuterium Targets
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• Proton polarizability and the Lamb shift in muonic hydrogen
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• Interpretation of electron-proton scattering at low Q^2
• Isolated Photons in Deep Inelastic Scattering
• Unified description of the non-singlet spin dependent structure function $g_1$ incorporating Altarelli-Parisi evolution and the double logarithmic $l{n}^2(1/x)$ effects at low $x$
• Evidence for Charge Symmetry Violation in Parton Distributions
• Parton transverse momenta and Drell-Yan dilepton production
• Comment on the recent COMPASS data on the spin structure function g_1
• QCD Precision Measurements and Structure Function Extraction at a High Statistics, High Energy Neutrino Scattering Experiment: NuSOnG
• Combining the small-x evolution and DGLAP for description of inclusive photon induced processes