[en] A possibility of existence of relatively long-living quasinuclear states of the N anti N system was shown theoretically earlier. The modern states of the problem is reviewed. γ radiation accompanies the annihilation of antiprotons. This radiation is found in anti p d annihilation. There are anomalies in annihilation of slow antiprotons. Rather intensive annihilation from triplet p states of anti pp and anti pd atoms is observed as well as deviation from the 1/v low for slow anti p. There was direct discovery of heavy ''quasinuclear'' anti NN mesons. Resonant N anti N states are seen in the energy behaviour of the anti pp and pd total cross sections and in the large angle anti pp elastic scattering cross sections

[en] The results of calculations of the masses of the radial excited mesons in the framework of the MIT bag model are presented. Corrections to the mass which comes from ''magnetic'' moment interaction are discussed. The model predictions for the masses of the first radial excited strange mesons are given. Among experimentally observed particles there are only two which can be identified as radial excitation in light mesons. They are rho' (1250) and rho' (1600). The model predicts two particles with masses of 1550 MeV and 1610 MeV, which corresponds to the first radial excitation of rho-type

[en] The nonabelian color gauge theory of quarks and gluons has been proposed as the basis for fundamental theory of hadrons. The features of this theory (quantum chromodynamics) are considered which lead to confinement. A transverse lattice formulation of the theory is also discussed, which is used as a basis for calculation of properties of the hadron bound states. The theory is quantized by eliminating the longitudinal degrees of freedom in favour of coulomb potential. Hadrons are formed as bound states of quarks and the symmetric phase gluons

[en] A theoretical model that predicts the existence of a new vector meson with the mass of M=1100 MeV in the spectrum of the vector mesons was proposed earlier. The main feature of the model is the use of a new type of the potential that binds two quarks inside a meson. The rho-meson excited state spectra and I/PSI particle mass spectrum are considered. All three particles appearing in the mass spectrum of the model exist in nature, provided that the quantum numbers of new vector meson coincide with the quantum numbers of the rho-meson as the model predicts. The model requires more than one (charmed) heavy quark in order to describe the I/PSI particle spectrum

[en] There are two approaches to strong interactions: colored quark gluon theory and the dual model. For the simplified situation where gluons are color synglets with an arbitrary mass an equivalence of both approaches is established. Using functional methods quantum flavour dynamics is transformed into an equivalent bilocal field theory, whose bare quanta propagate and interact just like hadrons in dual diagrams

[en] The application of the quasipotential approach to description of interactions between quarks is reported. There is a number of difficulties connected with the finite-difference character of the quasipotential equation. The main one is the problem of boundary conditions. The case of extremely heavy quark is also studied, which is suggested by the field-theoretical scheme in which the momenta of quanta off the mass shell belong to the de-Sitter space. In this case the attractive idea is to identify the quark with maximon. In such a case these particles originating due to the properties of the geometry of the momentum space are at the same time the fundamental constituents of hadrons

[en] The following problems are considered: what the constituents of the hadrons are; what their quantum numbers and their broken and unbroken symmetries are; what the dynamics of the constituents (equations, binding forces and the origin of symmetry violations) is. The most puzzling question is: why the constituents ''escape from freedom'' and are confined inside the hadrons; what experimentalists can report about the hadron constituents and their dynamics if not finding them. There are no final answers to all these questions. The achievements of quark model are described, some problems concerning the comparison of the quark model with experiment are considered. The attempt is also made to present alternative views on the same problems

[en] The main features of null-plane quasipotential approach is discussed, and an application to the asymptotic behaviour of composite particle form factors at large transverse momentum is reported. It is easy to include internal symmetries (light-cone algebra, SU(6), etc.) in this approach. There are wide classes of dynamical problems (lightlike quark symmetries, transverse momentum phenomena, nuclear and atomic bound states, etc) in which the application of null-plane quasipotential equations seems powerful

[en] The Abelian gauge theory of massless fermions (''quarks'') interacting with a massless neutral vector (''gluon'') field is considered. The Green two-particle functions of the quarks and vector gluons are computed. The graphical expression of the bilocal propagator and that of different terms in the expansion of path integrals for these functions are given

[en] Quasipotential equations in quantum field theory are a convenient method for investigating relativistic bound state problems. The quasipotential equation for the scattering amplitude of the equal mass scalar particles (quarks) is considered. The eigenvalue problem cannot be solved in terms of known special functions, and it is the Sturm-Liouville upper and lower spectral bounds technique which renders the problem solvable