Classical Non-Abelian Solitons

In two space-time dimensions a class of classical multicomponent scalar field theories with discrete, in general non-Abelian global symmetry is considered. The corresponding soliton solutions are given for the cases of 2, 3, and 4 components.Comment: 5 pages, KL-TH-94/2

Nucleon hologram with exclusive leptoproduction

Hard exclusive leptoproductions of real photons, lepton pairs and mesons are the most promising tools to unravel the three-dimensional picture of the nucleon, which cannot be deduced from conventional inclusive processes like deeply inelastic scattering.Comment: 9 pages LaTeX, 7 figures, sign in Eq. (16) corrected, Invited talk at the European Workshop "QCD structure of the nucleon", Ferrara, Italy, April 3-6, 200

Exclusive electroproduction of lepton pairs as a probe of nucleon structure

We suggest the measurement of exclusive electroproduction of lepton pairs as a tool to study inter-parton correlations in the nucleon via generalized parton distributions in the kinematical region where this process is light-cone dominated. We demonstrate how the single beam-spin asymmetry allows to perform such kind of analysis and give a number of predictions for several experimental setups. We comment on other observables which allow for a clean separation of different species of generalized parton distributions.Comment: 4 pages RevTeX4, 6 figures, typo fixe

Some Exact Solutions For The Classical Hall Effect In Inhomogeneous Magnetic Field

The classical Hall effect in inhomogeneous systems is considered for the case of one-dimensional inhomogeneity. For a certain geometry of the problem and for the magnetic field linearly depending on the coordinate the density of current distribution corresponds to the skin-effect.Comment: 5 pages, LaTe