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Information × Registration Number 0121U108812, ( 0224U002768  0224U002843  0224U002878  0224U033501  0226U000083  ) R & D request Title Studies on the properties of fundamental interactions in nuclear reactions, structure of exotic nuclei, high-energy physics, particle astrophysics, and cosmology Head Korchyn Oleksandr Yu., д.ф.-м.н. Registration Date 22-02-2021 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description1 Analysis of polarization effects in the reaction of electron-positron annihilation into a pair of top quarks (t-quarks) with the decay of the latter into bottom quarks (b-quarks), leptons and neutrinos, in order to study the coupling constants of t-quarks with photons and Z- bosons. Investigation and calculations of observables in semi-leptonic decays of B_c mesons to different states of charmonium. Model-independent analysis of the reaction of scalar- or vector-meson production (with the formation of nucleon-antinucleon pair) in electron-positron collisions. The amplitude of these reactions takes into account contribution of a number of known nucleon resonances with spins 1/2 and 3/2. Calculation of expressions for different observables (including polarization) in terms of transition electromagnetic form factors of the nucleon. A separate consideration of the case in which the amplitude does not include resonances (the Born approximation). An important goal of our research is building a new family of current operators due to exchange of clothed mesons between clothed nucleons. Our search in this direction is based on the clothing procedure, which was put forward a few years ago in relativistic quantum field theory (more precisely for its instantaneous form) by Greenberg and Schweber, and developed by collaboration between LTP (Dubna), INFN (University of Padowa, Italy) and ITP KIPT (Kharkov). Further development and refinement of the Dirac multiple eikonal scattering model for description of the p-A collisions at intermediate energies, based on realistic pN-amplitudes, and calculations of the nuclei structure in the relativistic mean-field approximation, analysis of the corresponding cross sections and spin observables, and investigation of the role of corrections in this model. popup.nrat_date 2024-12-09 Close