Научно-исследовательский институт ядерной физики имени Д.В. Скобельцына
Московского государственного университета имени М.В. Ломоносова

Заседание семинара состоится в режиме видеоконференции по ссылке.

In this talk we remind how the notion of the so-called clothed particles, put forward in relativistic quantum field theory by Greenberg and Schweber , can be used via the method of unitary clothing transformations (shortly, the UCT method) when finding the eigenstates of the total Hamiltonian H in case of interacting fields with the Yukawa - type couplings. In general, the UCT method is aimed at reduction of the exact eigenvalue problem in the primary Fock space to the model space problems in the corresponding Hilbert spaces of the contemporary quantum mechanics. In this context we consider an approximate treatment of the physical vacuum, the observable one-particle and two-particle bound and scattering states. In particular, starting from the primary Yukawa-type couplings between the ”bare” fermions (nucleons and antinucleons) and bosons (π -, η -, ρ -, ω - mesons, etc.) we have built up new families of the interactions (”quasipotentials”) between the ”clothed” particles (nucleons in the theory of nuclear forces, electrons and positrons in QED, etc.), responsible for physical processes in the corresponding systems (see, e.g., our lecture for the Ettore Majorana School [Shebeko A., Shirokov M. (2000) Progr. Part. Nucl. Phys 44], a survey in [Korda V., Canton L., Shebeko A. (2007) Ann. Phys 322] and our contributions to the Few-Body Conferences in Caen and Guildford [Kostylenko Y., Arslanaliev A., Shebeko A. (2020) Progr. FB Physics, eds. Orr N. et al., FB22 (2018); SciPost Phys. Proc. 3, EFB (2019)]). These quasipotentials are Hermitian and energy independent that make them attractive in practical calculations. In addition, we would like to draw your attention to our relativistic Faddeev calculations (in particular, with the so-called Kharkov potential) for the three-nucleon bound state (triton) and some Nd elastic scattering observables (published in Proc. of the FB22 Conference)