A5005790261- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Quantum Electrodynamics and Casimir Effect
- Cold Atom Physics and Bose-Einstein Condensates
- Noncommutative and Quantum Gravity Theories
- Quantum Mechanics and Applications
- Pulsars and Gravitational Waves Research
- Quantum and Classical Electrodynamics
- Nuclear physics research studies
- Relativity and Gravitational Theory
- Superconducting Materials and Applications
- Advanced NMR Techniques and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
Joint Institute for Nuclear Research
2016-2025
European Organization for Nuclear Research
1997-2025
Institute of High Energy Physics
2022-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
Kurchatov Institute
2018-2023
Rutgers, The State University of New Jersey
2023
Dubna State University
2011-2022
Moscow Engineering Physics Institute
2014-2021
Centre de Physique Théorique
2001-2021
Hadron pair production ${\ensuremath{\gamma}}^{*}\ensuremath{\gamma}\ensuremath{\rightarrow}h\overline{h}$ in the region where c.m. energy is much smaller than photon virtuality can be described a factorized form, as convolution of partonic handbag diagram and generalized distribution amplitudes which are new nonperturbative functions describing exclusive fragmentation quark-antiquark into two hadrons. Scaling behavior selection rule on helicity signatures this mechanism. The case $h$ pion...
The behavior of spin-1/2 particle in a weak static gravitational field is considered. Dirac Hamiltonian diagonalized by the Foldy-Wouthuysen transformation providing also simple form for momentum and spin polarization operators. operator equations motion are derived first time. Their semiclassical limit analyzed. dipole spin-gravity coupling previously found (another) does not lead to any observable effects. general agreement between quantum classical analysis established, contrary several...
We discuss the quantum and classical dynamics of a particle with spin in gravitational field rotating source. A relativistic equation describing motion curved spacetimes is obtained. demonstrate that precession perfect agreement derived from Foldy-Wouthuysen approach for Dirac spacetime. show effect depends crucially on choice tetrad. The results obtained are compared to earlier computations different tetrad gauges.
We study the $P$-odd effects related to vorticity of medium formed in noncentral heavy-ion collisions. Using kinetic quark-gluon strings model, we perform numerical simulations and hydrodynamical helicity for various atomic numbers, energies, centralities. observed vortical structures typically occupy relatively small fraction fireball volume. In course simulations, noticeable was manifest specific mirror behavior with respect reaction plane. The effect is maximal at Nuclotron based Ion...
We study the possibility of testing experimentally signatures $P$-odd effects related to vorticity medium. The chiral vortaic effect is generalized case conserved charges different from electric one. In baryonic charge and chemical potential, such an should manifest itself in neutron asymmetries measured by Multipurpose Detector at Nuclotron-Based Ion Collider Facility accelerator complex. required accuracy may be achieved a few months running. also discuss polarization hyperons correlations...
We discuss the quantum dynamics of a Dirac fermion particle in Poincar\'e gauge gravitational field. The minimal as well Pauli-type nonminimal coupling with external fields is studied, bringing into consideration notions translational and Lorentz moments. anomalous gravitomagnetic gravitoelectric moments are ruled out on basis covariance arguments. derive general Foldy-Wouthuysen transformation for an arbitrary configuration field without assuming it weak. Making use Hamiltonian coupled to...
We investigate the masses (ground state energies) of neutral pseudoscalar and vector meson in $SU(3)$ lattice gauge theory strong abelian magnetic field. The energy $ρ^0$ with zero spin projection $s_z=0$ on axis external field decreases, while energies non-zero spins $s_z=-1$ $+1$ increase $π^0$ decrease as a function calculated polarizabilities mesons for volume $18^4$. For $|s_z|=1$ extrapolations to spacing have been done. do not observe any evidence favour tachyonic mode existence.
We propose to constrain the gluon Wigner distribution in nucleon by studying exclusive diffractive dijet production process ultraperipheral proton-nucleus collisions (UPCs) at RHIC and LHC. Compared previous proposal Ref. [Y. Hatta, B. W. Xiao, F. Yuan, Phys. Rev. Lett. 116, 202301 (2016).] study same observable lepton-nucleon scattering, use of UPCs has a few advantages: not only is cross section larger, but extraction from data also becomes simpler, including its elliptic angular...
We study the energy dependence of global polarization $\Lambda$ hyperons in peripheral $Au-Au$ collisions. combine calculation vorticity and strange chemical potential framework kinetic Quark-Gluon String Model with anomalous mechanism related to axial vortical effect. The earlier found effect helicity separation implies quadrupole structure longitudinal vorticity. pay special attention temperature dependent contribution gravitational anomaly that preliminary RHIC data are compatible its...
We analyze in detail the problem of gauge invariance deeply virtual Compton scattering (DVCS) amplitude. Using twist-3 one-gluon exchange diagram contributions and QCD equations motion, we derive general invariant expression DVCS amplitude on a (pseudo)scalar particle (pion, ${\mathrm{He}}^{4}).$ Similarly to case deep inelastic scattering, does not depend quark-gluon correlations at Born level. The contribution derived single-spin asymmetry with longitudinally polarized lepton is calculated.
We study the possibility of experimentally testing manifestations equivalence principle in spin-gravity interactions. reconsider earlier experimental data and get first bound on anomalous gravitomagnetic moment. The spin coupling to Earth's rotation may also be explored at extensions neutron electric-dipole-moment $g\ensuremath{-}2$ experiments. terrestrial gravity produces a considerable effect which discovered planned deuteron experiment. should taken into account optical experiments...
Transverse parton momentum dependent distribution functions (TMDs) of the nucleon are studied in a covariant model, which describes intrinsic motion partons terms distribution. The consistency approach is demonstrated, and model relations among TMDs studied. As by-product it shown how allows to formulate nonrelativistic limit.
We study the quantum mechanics of a Dirac fermion on curved spacetime manifold. The metric is completely arbitrary, allowing for discussion all possible inertial and gravitational field configurations. In this framework, we find Hermitian Hamiltonian an arbitrary classical external (including electromagnetic ones). order to discuss physical content quantum-mechanical model, further apply Foldy-Wouthuysen transformation, derive equations motion spin position operators. analyze semiclassical...
We discuss the dynamics of Dirac fermions in general strong gravitational and electromagnetic fields. derive Hermitian Hamiltonian transform it to Foldy-Wouthuysen representation for spatially isotropic metric. The quantum operator equations motion are obtained semiclassical limit is analyzed. comparison mechanical classical shows their complete agreement. helicity fields discussed. Squaring covariant equation explicitly a similarity interactions with charged spinning particle.
We study the structure of vorticity and hydrodynamic helicity fields in peripheral heavy-ion collisions using kinetic Quark-Gluon String Model. The angular momentum conservation within this model holds with a good accuracy. observe formation specific toroidal structures field (vortex sheets). Their existence is mirrored polarization hyperons percent order.
We develop the general theory of spinning particles with electric and magnetic dipole moments moving in arbitrary electromagnetic, inertial, gravitational fields. Both quantum-mechanical classical dynamics is investigated. start from covariant Dirac equation extended to a spin-$\frac{1}{2}$ fermion anomalous then perform relativistic Foldy-Wouthuysen transformation. This transformation allows us obtain equations motion for physical operators Schr\"odinger form establish limit quantum...
Nucleon scattering by the classical gravitational field is described (energy-momentum tensor) form factors (GFFs), which also control partition of nucleon spin between total angular momenta quarks and gluons. The equivalence principle (EP) for dynamics results in identically zero anomalous gravitomagnetic moment, straightforward analog its electromagnetic counterpart. extended EP (ExEP) describes (approximate) validity separately gluons and, turn, equal momentum momentum. It violated quantum...
It has recently been shown that extremely strong electric fields can be created in central collisions of heavy ions, due to which the Schwinger effect significant. A direct analogue field hydrodynamics is acceleration medium. Using parton-hadron-string dynamics (PHSD) framework we model Au-Au at intermediate collision energies $\sqrt{s_{NN}}=4.5-11.5\,$GeV and obtain spatial distribution different time moments. The present study demonstrates high order 1 GeV may generated both non-central...
In this work, we present an overview of the recent results, obtained in framework fractional analytic QCD space-like (Euclidean) and time-like regions. The Higgs boson decays into a bottom–antibottom pair, polarized Bjorken sum rule is considered as application results.
The cross section of ${\ensuremath{\chi}}_{\mathrm{cJ}}$ hadroproduction is calculated in the ${k}_{\ensuremath{\perp}}$-factorization approach. We find a significant contribution ${\ensuremath{\chi}}_{c1}$ state due to non-applicability Landau-Yang theorem because off-shell gluons. results are agreement with data and, contrast collinear factorization, show dominance color-singlet part and strong suppression color octet contribution. Our could therefore lead solution long-standing...
We study analytical properties of the hard exclusive process amplitudes. found that QCD factorization for deeply virtual Compton scattering and vector meson production results in subtracted dispersion relation with subtraction constant determined by Polyakov-Weiss $D$-term. The this to fixed pole contribution Brodsky, Close, Gunion defined parton distributions is studied proved momentum transfers exceeding typical hadronic scale. continuation real photon limit considered, numerical...
A new parametrization of the generalized parton distributions $t$ dependence is proposed. It allows one to reproduce sufficiently well electromagnetic form factors proton and neutron at small large momentum transfer. The description data obtained by Rosenbluth method polarization are compared. results latter shown be compatible with correspondent data. impact parameter charge density examined. quark contributions gravitational nucleons obtained.