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New experimental data on π-meson production in interactions between carbon and tantalum nuclei at amomentumof 4.2 GeV/ c per nucleon are presented. These results are compared with predictions based of themodel of quark-gluon strings (QGS) that is adapted to intermediate energies ( $$ \sqrt 4 $$ ≤ 4 GeV). It is shown that the QGS model only qualitatively reproduces the behavior of experimental kinematical features of π mesons. [ABSTRACT FROM AUTHOR]

The results of theoretical calculations within the semihard ( k T-factorization) approach are compared with the latest data obtained in the ZEUS experiment at the HERA collider for the inelastic electroproduction of J/ψ mesons in the kinematical region specified by the inequalities 2 GeV2 < Q 2 < 80 GeV2, 50 GeV < W < 250 GeV, 0.2 < z < 0.9, and −1.6 < y ψlab < 1.3. The dependence of these theoretical results on the choice of parametrization among three widely used parametrizations of unintegrated gluon distributions is studied. [ABSTRACT FROM AUTHOR]

The process of Λ-baryon production in πp collisions is considered. The contribution of the string-junction mechanism to the strange-baryon production in meson-baryon scattering is analyzed. The results of numerical calculations in the framework of the quark-gluon string model are in reasonable agreement with the data. [ABSTRACT FROM AUTHOR]