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0222U005429,
0121U108687
,
A theory of phase transformations, kinetic and diffusion phenomena in condensed media
Bakai Oleksandr S.,
30-12-2022
National Science Center "Kharkiv Institute of Physics and Technology"
The observation of the recombination radiation line of the remnants of the supernova Cassiopeia A by Kharkiv scientists in 1978 made Ukraine a world leader in radio astronomy observations in the decameter range. The radiation came from highly excited (Rydberg) carbon atoms. This discovery caused a persistent interest in Rydberg atoms in Kharkiv. Electrons of Rydberg atoms are sensitive to interaction even with very weak electromagnetic fields, especially in the region of ionization of atoms. This requires the development of special mathematical methods. One such method is the spinor regularization of the Kepler problem, which is successfully used in celestial mechanics and is also useful in the theory of the hydrogen atom. Since the Rydberg atom is largely a hydrogen-like atom, spinor regularization should be useful in the theory of Rydberg atoms, especially when analyzing their interaction with external electromagnetic fields. This study is devoted to these questions. Integral cross sections, differential distributions and correlation observables in the birth of Z bosons together with bottom quarks, B and Y mesons and b-baryons in proton collisions were calculated under the conditions of the ALICE, ATLAS, CMS and LHCb experiments at the Large Hadron Collider in CERN. Rigid parton processes are modeled in three orders of the perturbation theory of quantum chromodynamics taking into account loop and tree contributions. Calculations were made with programs obtained using MadGraph5_aMC@NLO. Parton showers are included into the calculations using the Pythia 8 event generator. The fragmentation of quarks and gluons is described based on the Lund string model. Uncertainties of the results, originating from the dependence of cross sections on the scales of factorization and renormalization, as well as parameters arising from matching calculations based on matrix elements of parton processes and showers are studied.
Abyzov Olexander S
Alekseiechkin Mykola
Bakai Oleksandr Stepanovych
Bezugly Oleksii I
Borysenko Oleksandr O.
Davydov Leonid M
Kotliar Volodymyr V.
Lavrova Galyna M.
Lazarev Mykola P.
Mchedlov-Petrosian Petro O.
Poluektov Yurii M
Soroka Oleksii O.
Stepanovskii Yurii P.
Turkin Anatoliy A.
Chechkin Oleksiy V.
2022-12-30
Updated: 2025-12-29
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