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Volodymyr Kotlyar

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Papers by Volodymyr Kotlyar

Research paper thumbnail of Production of cc¯ and bb¯ Quark Pairs in pp Collisions at Energies of Experiments at the Large Hadron Collider

East European Journal of Physics, 2019

Production of charm and beauty quark–antiquark pairs in proton–proton collisions is simulated wit... more Production of charm and beauty quark–antiquark pairs in proton–proton collisions is simulated with the codes generated in the framework of MadGraph5_aMC@NLO. The tree–level partonic processes are taken into account in first three orders of the perturbative quantum chromodynamics. The considered hard processes have two, three, and four partons in the final states. These final states contain one or two heavy quark–antiquark pairs. The calculations are performed with parton distribution functions (PDF) obtained with neural network methods by NNPDF collaboration. Influence of the multiple partonic interactions (MPI), initial– and final–state showers on the cross sections (CSs) is studied consistently taking advantage of Pythia 8 event generator. The CSs are computed in central and forward rapidity regions under conditions of the ALICE and LHCb experiments at the Large Hadron Collider at CERN. The studied transverse momentum interval of the heavy quarks spreads up to 30 GeV/c. The CSs ca...

Research paper thumbnail of Effects of higher order in the nuclear-deformation parameters in the elastic scattering of heavy ions

Research paper thumbnail of Tensor and Operator Forms of 3He and 3H Wave Functions for Parity-Violating Nuclear Forces

Tensor representation (TR) for wave function (WF) of three-nucleon bound state with the total ang... more Tensor representation (TR) for wave function (WF) of three-nucleon bound state with the total angular momentum I = 1/2 is discussed. The WF in TR has 16 complex components depending on vectors of relative momenta. Constraints on the WF imposed by requirements of invariance with respect to space inversion and time reversal are studied. Both parityeven and parity-odd components of the 3N bound state are constructed using 16 scalar functions. The arguments of the functions are magnitudes of relative momenta and scalar product of the momenta. With nuclear forces being time-reversal invariant these functions are real. The WF in TR is converted into an operator form (OF), accounting for parity violating contributions. Properties of operator representations for WFs of 2N and 3N nuclei are compared.

Research paper thumbnail of Conservation of the electromagnetic current of the nucleus and calculation of cross sections for the ³He(gamma-arrow-right, p)d reaction

Research paper thumbnail of Polarization phenomena in photo- and electrodisintegration of the lightest nuclei at medium energies

Research paper thumbnail of CALCULATION OF POLARIZATION OBSERVABLES IN PHOTO-AND ELECTRODISINTEGRATION OF 3 He

Research paper thumbnail of Spin Structure of Three-Nucleon Bound States

The spin-dependent momentum distributions (SDMDs) of nucleons and proton-deuteron clusters in pol... more The spin-dependent momentum distributions (SDMDs) of nucleons and proton-deuteron clusters in polarized He 3 and H 3 nuclei are studied with wave functions (WFs) for realistic models of nuclear forces.

Research paper thumbnail of The Coulomb integrals and the diffraction model of transfer reactions

Zeitschrift f�r Physik A Atoms and Nuclei, 1981

ABSTRACT

Research paper thumbnail of Nucleon-nucleon interaction and meson exchange current effects in3He two-body breakup by polarized photons

Zeitschrift f�r Physik A Atomic Nuclei, 1987

Cross sections for the reaction3He(?, p)d have been calculated with the Faddeev wave functions of... more Cross sections for the reaction3He(?, p)d have been calculated with the Faddeev wave functions of the3He nucleus. The parametrized forms of the functions have been used for two different types ofNN interaction, viz., the separable Mongan potential (MP) and the Reid soft-core (RSC) potential. Contributions of meson exchange currents (MEC) to this process have been considered. Constraints imposed by the continuity equation for the nuclear current are discussed. The calculated results are compared with new data obtained recently at Kharkov.

Research paper thumbnail of Diffraction phenomena in elastic scattering of heavy ions

Research paper thumbnail of Production of cc¯ and bb¯ Quark Pairs in pp Collisions at Energies of Experiments at the Large Hadron Collider

East European Journal of Physics, 2019

Production of charm and beauty quark–antiquark pairs in proton–proton collisions is simulated wit... more Production of charm and beauty quark–antiquark pairs in proton–proton collisions is simulated with the codes generated in the framework of MadGraph5_aMC@NLO. The tree–level partonic processes are taken into account in first three orders of the perturbative quantum chromodynamics. The considered hard processes have two, three, and four partons in the final states. These final states contain one or two heavy quark–antiquark pairs. The calculations are performed with parton distribution functions (PDF) obtained with neural network methods by NNPDF collaboration. Influence of the multiple partonic interactions (MPI), initial– and final–state showers on the cross sections (CSs) is studied consistently taking advantage of Pythia 8 event generator. The CSs are computed in central and forward rapidity regions under conditions of the ALICE and LHCb experiments at the Large Hadron Collider at CERN. The studied transverse momentum interval of the heavy quarks spreads up to 30 GeV/c. The CSs ca...

Research paper thumbnail of Effects of higher order in the nuclear-deformation parameters in the elastic scattering of heavy ions

Research paper thumbnail of Tensor and Operator Forms of 3He and 3H Wave Functions for Parity-Violating Nuclear Forces

Tensor representation (TR) for wave function (WF) of three-nucleon bound state with the total ang... more Tensor representation (TR) for wave function (WF) of three-nucleon bound state with the total angular momentum I = 1/2 is discussed. The WF in TR has 16 complex components depending on vectors of relative momenta. Constraints on the WF imposed by requirements of invariance with respect to space inversion and time reversal are studied. Both parityeven and parity-odd components of the 3N bound state are constructed using 16 scalar functions. The arguments of the functions are magnitudes of relative momenta and scalar product of the momenta. With nuclear forces being time-reversal invariant these functions are real. The WF in TR is converted into an operator form (OF), accounting for parity violating contributions. Properties of operator representations for WFs of 2N and 3N nuclei are compared.

Research paper thumbnail of Conservation of the electromagnetic current of the nucleus and calculation of cross sections for the ³He(gamma-arrow-right, p)d reaction

Research paper thumbnail of Polarization phenomena in photo- and electrodisintegration of the lightest nuclei at medium energies

Research paper thumbnail of CALCULATION OF POLARIZATION OBSERVABLES IN PHOTO-AND ELECTRODISINTEGRATION OF 3 He

Research paper thumbnail of Spin Structure of Three-Nucleon Bound States

The spin-dependent momentum distributions (SDMDs) of nucleons and proton-deuteron clusters in pol... more The spin-dependent momentum distributions (SDMDs) of nucleons and proton-deuteron clusters in polarized He 3 and H 3 nuclei are studied with wave functions (WFs) for realistic models of nuclear forces.

Research paper thumbnail of The Coulomb integrals and the diffraction model of transfer reactions

Zeitschrift f�r Physik A Atoms and Nuclei, 1981

ABSTRACT

Research paper thumbnail of Nucleon-nucleon interaction and meson exchange current effects in3He two-body breakup by polarized photons

Zeitschrift f�r Physik A Atomic Nuclei, 1987

Cross sections for the reaction3He(?, p)d have been calculated with the Faddeev wave functions of... more Cross sections for the reaction3He(?, p)d have been calculated with the Faddeev wave functions of the3He nucleus. The parametrized forms of the functions have been used for two different types ofNN interaction, viz., the separable Mongan potential (MP) and the Reid soft-core (RSC) potential. Contributions of meson exchange currents (MEC) to this process have been considered. Constraints imposed by the continuity equation for the nuclear current are discussed. The calculated results are compared with new data obtained recently at Kharkov.

Research paper thumbnail of Diffraction phenomena in elastic scattering of heavy ions

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