[en] After a short review of some properties of hadronic multi-particle systems which show the presence of a statistical mechanism, particle production is described in soft hadronic collisions using the quark recombination model. Finally, particle production in hard collisions, in particular large transverse momentum processes and the occurence of gluon jets in deep inelastic processes is discussed within the framework of QCD perturbation theory. (author)

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[en] The following applications of the statistical bootstrap model (SBM) to hadron production in hadron-hadron collisions are discussed: (1) the independent fireball production model (IFPM); (2) single particle distributions in the IFPM (thermodynamic model); (3) production of heavy particles and pairs of heavy particles; (4) two-particle distributions and correlations in the IFPM and the Bose effect; (5) large psub(perpendicular) phenomena and fireball models; (6) N anti N annihilation at rest in the SBM. (author)

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[en] The majority of the presently available experimental data is consistent with hard scattering models. Therefore the hard scattering model seems to be well established. There is good evidence for jets in large transverse momentum reactions as predicted by these models. The overall picture is however not yet well enough understood. We mention only the empirical hard scattering cross section introduced in most of the models, the lack of a deep theoretical understanding of the interplay between quark confinement and jet production, and the fact that we are not yet able to discriminate conclusively between the many proposed hard scattering models. The status of different hard collision models discussed in this paper is summarized. (author)

[en] The production of weak vector bosons in hadron hadron collisions at collider energies is discussed. It is shown that QCD-electroweak interference strongly influences the production cross sections of vector bosons in polarized and unpolarized proton-proton and antiproton-proton collisions and their detection via hadron jets. The polarization of sea quarks as predicted by QCD via the Altarelli-Parisi equations influences strongly the production cross sections in pp collisions. (author)

[en] The dual topological unitarization of hard and soft hadronic collisions is formulated as a Monte Carlo event generator for events containing both the soft (low p_{perpendicular}) and hard (jets, minijets) component of hadron production. The parameters of the model are determined from fits to the energy dependence of the total and inelastic hadron cross-sections and from the predictions of the QCD-parton model for the perturbative hard constituent scattering cross sections. The predictions of the model for TeV colliders are presented. Interesting changes of the produced multiparticle system are found when selecting classes of events with and without hard jets or minijets. (author)

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[en] The dual topological unitarization of hard and soft hadronic cross sections is a new model of hadronic multi-particle production, which treats both soft (low p_{perpendicular}) and hard (minijet, large p_{perpendicular}) processes in a unified and consistent way. This description is important at the TeV-energies of hadron colliders, where the hard perturbative cross sections of QCD become large and comparable to the total cross sections. The code DTUJET samples Monte carlo events in pp and bar pp collisions according to this new model. 15 refs., 3 figs