[en] The manifestationsof the ω->3πcontact term and its unitary partners are investigated in the framework of the chiral effective Lagrangian theory with vector mesons. 53 refs

[en] We perform an analysis of the electromagnetic π⁰ and ω transition form factors, which are induced by the axial anomaly. The main contribution to these processes comes from the triangle quark graph, which reproduces the exact anomaly value at the low energy limit. We call this the ''anomaly term,'' to which we direct our attention in a relatively high energy region and get the information from the existing experimental data of the above transition form factors. Our results shows that it is essential to use the constituent quark mass instead of the current quark mass in evaluating the anomaly term from the triangle graph

[en] An unstable two-level system decaying into an arbitrary number of channels is considered. It is shown that the mixing phases of the two overlapping resonances can be expressed in the terms of their partial widths and one additional universal mixing parameter. Some applications to a doublet of 2⁺ resonances in ⁸Be and to the ρ-ω systems are considered. 18 refs

[en] rho-ω mixing, a nonelectromagnetic isospin violation, is shown to be able to account for the neutron-proton mass difference. The analysis is done in the framework of the SU(2) Skyrme model and the result is in good agreement with experimental data

[en] We model the N bar N system at rest as a baryon number zero lump in the Skyrme model including the ω field. We integrate the classical equations of motion from the highly nonperturbative annihilation region into the noninteracting radiation zone. Subsequent coherent state quantization of the radiation field give a good description of the pion spectrum from annihilation at rest

[en] Nucleon-nucleon interaction input is evaluated in phase and polarization of NN-dissipation from exchange of vector particles on the mass surface

[en] Kinetic theory formulae are derived for the dilepton production rate from processes of the type 1+2+3→l⁺l^- and 1+2→3+(l⁺l^-) in hadronic or partonic systems. The formalism is applied to three-pion reactions π⁺π^-π⁰→μ⁺μ^-, π^±π⁰→π^±μ⁺μ^-, and π⁺π^-→π⁰μ⁺μ^- in a thermalized hadron gas. The dilepton mass spectra are compared to those from previously considered reactions at different temperatures. The three-pion processes amplify the ω(783) and φ(1020) peaks in the dilepton mass spectrum. The consequences for using resonance dileptons as a tool for measuring mean lifetime and temperature of hadronic fireballs are discussed

[en] Predictions on elementary cross sections for dielectron production in pd-reaction at initial energies pf 1-5 GeV are presented. Assumptions, essential for description of the in dielectron distribution with invariant mass near p/ω resonance region, are made

[en] Within the nonlinear chiral model, we have calculated the P-odd interaction constants of nucleaons with π, ρ, and ω mesons. We have established a hierarchy of these constants controlled by the small parameters sin² θ_W and 1/N_c; this hierarchy implies that the ratio of the πNN and ρNN interaction constants is small and proportional to sin² θ_W/N_c. In all cases, the values of the constants obtained here are considerably larger than in the SU(6)_W model, which shows that it is necessary to take into account P-odd effects caused by overlap of the nucleon wave functions and weak interactions between the nucleon constitutents

[en] In the quark model of a superconductor type the problem of arising of the nonphysical vertices for the low energy interaction between the low mesons connected with the spontaneous breaking of a chiral symmetry and a P-A diagonalization under the usual construction of the effective chiral Lagrangian is considered. The prescriptive problem solution is proposed. It is based on the Pauli-Willars regularization of the quark diagrams decribing the vertices for the low energy meson interaction arised due to P-A diagonalization. It is necessary to use the regularization because of the ambiguity of the calculation of some quark diagrams describing the new interaction vertices