Search academic texts

Information × Registration Number 0225U004668, (0125U002866) , R & D reports Title Research of trinucleon systems and electromagnetic processes in modern high-energy physics popup.stage_title Теоретичне дослідження ефектів порушення CP-інваріантності у процесах електрон-позитронної анігіляції з утворенням поляризованої пари важких кварків та їх розпадом, із побудовою поляризаційно-чутливих CP-асиметрій для виявлення потенційних сигналів нової фізики за межами Стандартної моделі. Визначення диференціального перерізу розсіювання швидких заряджених частинок на одношаровій нанотрубці в ейкональному наближенні квантової електродинаміки для різних орієнтацій нанотрубки відносно налітаючої частинки. Head Truten Ivan V., Доктор філософії Registration Date 16-12-2025 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description1 The aim of the work is to develop a new approach to constructing trinucleon interaction operators for performing calculations of wave functions and differential cross sections of reactions in the trinucleon sector of Fock space. As a result, numerical calculations of the wave functions of triton and helium-3 will be performed, and the influence of off-shell effects will be studied. Another goal of the work is to develop a theoretical description of the scattering of fast charged particles on targets of complex structure. As a result, it is planned to obtain a differential cross-section of particle scattering on a multilayer nanotube in the eikonal approximation of quantum electrodynamics for different orientations of the nanotube relative to the incident particle. In addition, the aim is to develop a theoretical approach to the analysis of electron-positron annihilation processes with polarized beams, in particular for constructing energy observables sensitive to CP-violation. The quantities reflecting the change in the average energy and energy asymmetry of bottom quarks upon inversion of beam polarizations are considered, which allows us to detect interference effects caused by the terms of new physics. The obtained results can serve as a theoretical basis for future experimental tests at the new generation of electron-positron colliders. popup.description2 The energy correlations of bottom and antibottom quarks arising in the decays of a top quark pair born in electron-positron annihilation with longitudinally polarized initial beams are considered. A normalized double energy distribution of decay products is constructed and its CP-even and CP-odd components are identified. Integral energy observables are proposed: event number asymmetry and the difference in the average energies of bottom quarks, which are sensitive to CP-invariance violation. The impact of beam polarization inversion on the value of these observables is illustrated, and it is shown that this procedure allows effective isolation of interference contributions caused by new physics. The scattering of a fast charged particle on a single-walled zigzag carbon nanotube oriented at various angles with respect to the direction of the initial motion of the incident particle is considered. Differential scattering cross sections for this problem are obtained for different values of the nanotube inclination angle. The influence of the nanotube inclination angle on the differential scattering cross section is illustrated. Product Description popup.authors Yan O. Kostylenko Viktoria D. Omelchenko popup.nrat_date 2025-12-16 Close