
Fundamental Interactions of Fields and Particles
Argentina, Armenia, Azerbaijan, Belarus, Bulgaria, Canada, CERN, Chile, China, Czech Republic, Finland, France, Georgia, Germany, Hungary, ICTP, India, Italy, Japan, Kazakhstan, Mexico, Mongolia, New Zealand, Norway, Portugal, Poland, Republic of Korea, Russia, Serbia, Slovakia, Spain, Sweden, Switzerland, Ukraine, United Kingdom, USA, Uzbekistan, Vietnam.
The
main aim of the research within the theme is the construction of
theoretical models and their application to the description of
properties of elementary particles and their interactions. This
research includes the following directions of activity.
Derivation of hypergeometric functions of one and several variables in terms of iterated integrals in the frames of the fractional derivation technique. Search for an iterated integral representation of a class of special functions for Feynman diagrams. Evaluation of the renormalon contributions to twopoint correlators of composite quark currents in QCD. Study of the α_{s}^{2} contribution to the hadronic structure function of DrellYan processes in the framework of perturbative QCD. Study of the critical behavior of 3dimensional QCD and its supersymmetric generalization in the first two orders of the 1/N_{f }expansion. Study of the critical behavior of 3dimensional QED in the first three orders of the 1/N_{f }expansion through the anomalous dimension of the fermion mass. Study of the role of axionlike particles in experiments of electronnucleon scattering. The role of New physics in anomalous magnetic moments of leptons and electric dipole moments of nucleons. Development of a semianalytical approach for the evolution of transversemomentumdependent parton densities to the nexttoleading order. Construction of a semianalytical approach for double parton distributions.
Establishment
of the relation between effective cross sections of double parton
scattering
Revision of distribution amplitudes (leading twist) of (pseudo)scalar and (longitudinal and transverse) vector mesons within QCD SRstaking into account new QCD corrections obtained for all of its components. Theoretical analysis and a development of propositions for setting up an experiment for measurement of tensor electric and magnetic polarizabilities of the deuteron. Investigation of the properties and energy dependence of new effects, which were determined in the experimental data by the TOTEM Collaboration at an energy of 13 TeV.Determination of the properties of the longrange hadron potential, which lead to peculiar properties of the differential crosssections of hadronhadron elastic scattering. Study of the generalized transverse momentum dependent distributions by restoring the Sivers function in an alternative way, involving the newfound additional contribution in the inverse Radon transforms. Investigation of the role of the gluon poles in the twophoton process producing transverse polarized hadrons with different fragmentation functions. Investigation of the role of the twist3 quarkgluonquark correlation function in studying the hadron structure. Study of the sum rules for hadron structure functions and fragmentation functions in quantum chromodynamics (QCD) with the use of the generalized truncated Mellin moments approach (TMM). Study of the fragmentation functions in the inclusive pion and kaon production in protonproton collisions in the NICA project. Numerical optimization of perturbative series for observables using the renormalization group in QCD. Applications of the DIS sum rules and comparison with experimental data. Study of Generalized Parton Distribution (GPDs) properties and GPDs effects in meson leptoproduction at modern colliders. Study of the effects of magnetic monopoles and instantons in QCD on the hadron properties by simulations of lattice gauge theory. In particular, precise estimation of the number of instantons and antiinstantons, masses of the charm quark, eta prime and baryons, and the decay constants of mesons and baryons. Determination of the quantitative relations between the density of the number of instantons and antiinstantons and these observables. Investigation of possible detection of the monopole and instanton effects in experiments.
Еlaboration of semianalytical methods for computation of bound statesspectral functions in effective meson and quarkmeson models by means of the nonperturbative renormalization group approach and their furtherimplementation for calculation of decay widths and study of massgeneration mechanisms for light mesons. Study the role of leptoquarks in explanation of the flavor anomalies observed in precision experiments. Derivation of the effective Lagrangian of the Nonrelativistic Quantum Electrodynamics (NRQED) that takes into account all interactions necessary for calculationof the bound states of Coulomb systems with a precision up to and included the order of mα^{7}. Calculation of the hyperfine splitting of spectral lines in rhovibrational transitions of molecular hydrogen ions with a relative accuracy of 10^{−7}, which is necessary for the analysis of new precision experiments. Improvement ofthe values of the fundamental constants of atomic physics (Rydberg constant, the protontoelectron mass ratio) by imposing more stringent restrictions on the interaction potentials of the "fifth" force. Analysis of possibilities for a search for dark matter axions in spin experiments in storagerings.
Study of the anisotropy of the static quarkantiquark potential in the presence of rotation. Calculation of the moment of inertia of rotating gluon plasma in rotating lattice QCD. Investigation of the effect of quantum anomalies on transport phenomena in a vortical relativistic fluid containing also elementary particles with higher spins in external fields. Investigation of anomaly induced quantized vortices in mesonic superfluids and their effect on baryon polarization. Improvement of the prediction of the global Λ polarization in the NICAFAIRHADES energy range, including its centrality and rapidity dependence. Calculation of splitting of the ΛantiΛ polarization within the thermodynamic approach including splitting induced by the meson field and the recently proposed thermal shear contribution. Modeling of lightnuclei production in heavyion collisions in the SPSRHIC energy range within the thermodynamic approach based on the threefluid dynamical model and a comparison of the results with experimental data. Study of a response of neutral and charged Fermisystemswith condensates of the vector fields, such as the triplet pairing, on the rotation. Special attention will be paid to the consideration of the possibility of selfrotation in nuclear systems. Study of the influence of the effects of polarization of the dense nuclear matter on the properties of excitations with quantum numbers of the pion and on their sp condensation in the framework of the quasiparticle approximation and beyond it. The results will be applied to describe protoneutron stars and nucleusnucleus collisions. Calculation of the thermodynamic potential and investigation of the superfluid / superconducting phase transition andscaling in SU(N) symmetric equilibrium systems of ultracold fermions in the framework of the nonperturbative renormalization group. Demonstration that the origin of the correlations between low and highp_{t} flow components in peripheral leadlead collisions is traced to correlations of particles injets. Demonstration that the third eccentricity has a pure fluctuation originand is substantially dependent on the size of the overlap area only, whilethe second eccentricityis mainly related to the average collisiongeometry. Study of the propagation of nonlinear waves in the hot, viscous, nonextensive quarkgluon plasma. Analytical calculation of quantum Tsallis thermodynamic variables. Derivation of the Tsallislike quantum single particle distributions (to be used in highenergy collision physics) from nonextensive Green's functions. Comparison of them with the results obtained using the Tsallis statistical mechanics. Preliminary magneto hydrodynamic simulation at nonzero conductivity in the context of heavy ion collisions.
Calculation of the widths of tau lepton decays into hadrons and crosssections of the electronpositron annihilation into hadrons in the framework of the NambuJonaLasinio model including rectification of the results for the tau lepton decays into hadrons obtained earlier with taking into account meson interaction in the final states. Development of a simulation package for production of pions generated in interactions of neutrinos and charged leptons with nucleons within the framework of the GENIE neutrino generator. Implementation of a new model (the socalled MK model) of resonant production of pions and improvement of the earlier models based on the SU(6) relativistic quark model. Adjustment of the parameters of the models with inclusion of modern acceleration data. Exploiting of the quasidirac neutrino scheme for conclusions on the potential of neutrino oscillations and doublebeta decay experiments to determine absolute scale of neutrino masses. Investigation of the corrections to the reactor antineutrino flux by considering the impact of new atomic and nuclear effects on the corresponding differential characteristics.
