[en] Within the framework of the quark-parton approach and vector dominance model the sum rule for the axial-vector structure constant in the radiative decay of the charged pion, following from the current algebra and PCAC, is calculated. The value close to zero is found in agreement with the recent experimental data

[en] The model of breaking of the unitary symmetry for a parton-parton interaction is used to derive the modified Weinberg sum rules. The pole saturation of the modified sum rules leads to the model of mass mixing of the ω-PSI system and to apperance of an essential correction in the ratios for constants of lepton decays of strange mesons

[en] Within the framework of the relativistic model with universal potential of quark interaction hadron static properties are investigated. The model is based on the choice of the universal potential of qq^- interaction, determining effective quark interaction in multiparticle systems. The calculation of masses, magnetic moments radiative meson decay widths baryons and exotic multiquark hadrons is performed. Quark dimensions and ''hyper-- fine'' structure of hadron radial excitations are discussed as well

[en] Some experimental tests are proposed for excitation of the hadron coloured degrees of freedom and for internal and spatial symmetries in the μN deep inelastic scattering generating multimuon states. The importance is stressed of separation of the observed cross-section into the longitudinal and transversal part for checking the coloured gluon production and dynamical implication of new mass scale related to 'heavy' partons inside nucleons

[en] The earlier suggested and developed idea of quark-hadron duality, underlying ''bremsstrahlung-weighted'' sum rules for total or polarized photon interaction cross sections, is applied to the description of excitation of light scalar mesons in gamma-gamma interactions. The emphasis is put on the discussion of a role of the scalar diquark cluster degrees of freedom in the radiative formation of light scalar mesons

[en] The solutions of a set of sum rules for magnetic moments of hyperons and slopes of the form factors at the pomeron-baryon vertices (i.e., the logarithmic slopes of the corresponding baryonic differential cross sections of baryon-nucleon elastic scattering) are presented. They agree with available experimental data, in particular, with large magnetic moment of the Ψ^- hyperon, causing difficulty for standard theoretical models. Some other consequences to be tested in experiments with high-energy hyperon beams are proposed

[en] Magnetic moments of baryons are analyzed on the basis of general sum rules following from the theory of broken symmetries and quark models including the relativistic effects and hadronic corrections due to the meson exchange currents. A new sum rule is proposed for the hyperon magnetic moments, which is in accord with the most precise new data and also with a theory of the electromagnetic ΛΣ⁰ mixing. The numerical values of the quark electromagnetic moments are obtained within a hybrid model treating the pion cloud effects through the local coupling of the pion field with the constituent massive quarks. Possible sensitivity of the weak neutral current magnetic moments to violation of the Okubo-Zweig-Izuki rule is emphasized nand discussed. 39 refs.; 1 fig

[en] The breaking of the SU(3)-summetry results in the mass shifts, modification of the interaction amplitude and mixing od states belonging to different representations of the SU(3)-group. The effects of the SU(3)-breaking in masses and electromagnetic decays of vector mesons are considered

[en] Magnetic moments of the octet baryons are considered in the frameworks of phenomenological sum rules based on the general groundwork of quark models that include relativistic effects and nonadditive corrections due to the pion exchange currents. The relations between the u, d, s-quark magnetic moments thus obtained are then used for an analysis of the vector and pseudoscalar meson radiative decays. The parameters related to the quark content of the η and η'-mesons are compared with the corresponding quantities extracted from the measured hadronic J/Ψ-decays

[en] The phenomenological sum-rule-based approach is used to discuss the quark composition dependence of some static electroweak characteristics of nucleons. The role of nonvalence degrees of freedom (the nucleon sea partons and/or peripheral meson currents) is shown to be important to select and make use of the relevant symmetry parametrization of hadron observables. The implication of hidden strangeness of the nucleon for the recently observed OZI-rule violation in antinucleon-nucleon annihilation reactions is pointed out. Some further consequences of a general sum rule approach to baryon electroweak coupling constants are presented and discussed. 17 refs