abstract

A deep inelastic scattering of leptons on a nuclear target is considered in the framework of a multiquark cluster mode! and the nuclear structure functions are calculated. Analysis of the EMC effect is performed and it is shown that the given model can describe experimental data for the nuclear structure functions and their ratios not only in the kinematical region \(x \lt 1\), but also it allows one to predict the behaviour of these quantities in the region \(x \gt 1\) which is not sufficiently well studied experimentally.

abstract

The construction of heterotic string theories in \(d \lt 10\) dimensions is reviewed within the framework of the covariant lattice approach. Methods of (super) conformal field theory, necessary to calculate string scattering amplitudes, are described and applied to a 4-dimensional model. From the calculated amplitudes we extract the (point particle) field theory which reproduces these amplitudes in the limit of infinite string tension.

abstract

We describe a recently developed renormalization group improved version of the program of Yennie, Frautschi and Suura for the exponentiation of infrared divergences in Abelian gauge theories. Particular attention is paid to the relevance of this renormalization group improved exponentiation to Z\(^0\) physics at SLC and LEP.

abstract

We demonstrate how the theoretical knowledge about multiparticle production in deep inelastic lepton scattering can be incorporated into a multistring model for low \(p_t\) proton proton collisions.

abstract

We review the negative binomial properties measured recently for many multiplicity distributions of high energy hadronic, semi-leptonic and leptonic reactions in selected rapidity intervals. We analyse them in terms of the “clan” structure which can be defined for any negative binomial distribution. By comparing reactions we exhibit a number of regularities for the average number \(\overline {N}\) of clans and the average charged multiplicity \(\overline {n}_{\rm c}\) per clan.

abstract

The Glauber picture of the nucleus–nucleus collisions is tested in the most direct way, i.e. by comparison of the Glauber-type calculation of the wounded nucleon number distribution with the data on spectator charge distribution measured in several Dubna experiments. We get reasonable agreement with the propane bubble chamber and streamer chamber data. The emulsion data seem to disagree with our calculation.