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Theory of Fundamental Interactions

• Calculation of the amplitudes in maximally supersymmetric theories in extra dimensions.
  
  Analysis of possible SUSY search strategies at the LHC in the framework of the MSSM and NMSSM.
  
  The interpretation of experimental data on supersymmetry searches coming from the ATLAS and CMS collaborations.
  
  Theoretical analysis of effects due to radiative corrections in Drell-Yan processes taking into account new experimental conditions being relevant after increasing LHC luminosity and beam energy.
  
  The investigation of the Q ² evolution of the average multiplicities with the double-logarithm resummation taken into account.
  
  Consideration of the Q ² evolution of the structure function F₂, its derivations and heavy quark parts at small x in the first three orders of perturbation theory.
  
  Studies of the dark matter problem and searches for different dark matter particle candidates both in the Standard Model and beyond it, in particular within supersymmetric theories.
  
  Investigation of the low-energy behavior of the hadronic vacuum polarization function within the dispersive approach to QCD.
  
  Calculation of different four-loop contributions to beta-functions and anomalous dimensions in the Standard Model and its supersymmetric and non-supersymmetric extensions.
  
  
• Derivation of the complete analytical expression for the missing contribution of the three-loop radiative correction to the pion transition form factor.
  
  Investigation of the evolution of spin structure functions and their truncated moments at low Q ² in the NLO approximation and with account for models of coupling in the infrared region and higher twists.
  
  Investigations of transverse-momentum dependent parton distributions for Drell-Yan processes and direct photon production within the NICA project. Construction of global fits for Sivers functions with account for evolution effects, constraints from g₂ structure functions and sum rules.
  
  Lattice calculations of form factors related to quark spin and orbital angular momenta and their comparison with the constraints implied by the equivalence principle.
  
  Development of the general theory of wave packets. Construction of a model of a covariant asymmetric wave packet and detailed study of its properties. Derivation of general formulae for an effective 4-momentum of neutrino in ultra-relativistic and non-relativistic cases.
  
  Investigation of the correlation functions of the color charged field fluctuations in the confinement regime within the domain model of QCD vacuum. Study of the spectral properties of the color charged quasi-particles and thermodynamics of the heterophase state of hadronic matter under conditions of the relativistic heavy ion collision.
  
  
• Description of tau lepton decays with taking into account radial excited states of vector and axial vector mesons within the extended Nambu-Jona-Lasinio model.
  
  Derivation of the full set of evolution equations for the transverse-momentum dependent parton distribution functions basing on the results on geometrical and group properties of the Wilson loop space.
  
  Investigation of the role of non-Gaussian probability distributions in the description of the nonperturbative input in the phenomenology of the polarized semi-inclusive processes studied at the JLab, RHIC and future Electron-Ion Collider (EIC).
  
  Complete analysis of nonleptonic decays of the whole family of bottom and charm baryons into an ordinary baryon and a meson. Calculation full of decay widths and parameters of various asymmetries.
  
  In view of the fact that the rates for the semileptonic decays of B-meson into D (Dstar)-meson and a pair of tau-lepton + tau-neutrino deviate from the Standard Model (SM) predictions by up to 4.5 standard deviations, it is important to scrutinize the corresponding semileptonic baryon decay Lambda-b into Lambda-c. Evaluation of the relevant form factors in the framework of the covariant quark model. Development of the theoretical formalism for these decays by using helicity methods including lepton mass effects.
  
  In the case of the semileptonic B-decays, in addition to the SM operators one should also take into account the scalar and tensor four-Fermi operators, which can be induced by the effects of new physics. Evaluation of the form factors in the framework of the covariant quark model and derivation of the full angular decay distribution. Numerical analysis of the physical observables.
  
  
• Participation in the tmfT Collaboration (finite temperature with twisted mass fermions) aimed at description of the quark-gluon thermodynamics including strange and charmed quarks, consideration of new observables indicating the crossover.
  
  Investigation of topological aspects of the quark-gluon plasma (monopoles, dyons, vortices etc.) and estimation of the contribution of these degrees of freedom to trace anomaly, energy density etc.
  
  Evaluation of transport coefficients in the u-d-s-c-gluon plasma (jet quenching, heavy quark diffusion, dilepton rates etc.).
  
  Model calculations of the generation of vorticity in heavy-ion collisions and its effect on P-odd correlations of quarks and mesons in the NICA project.
  
  Investigation of the role of color degrees of freedom at the early stage of heavy-ion interactions within the model of Parton Hadron String Dynamics (PHSD), estimation of the intensity of chromoelectric and chromomagnetic fields created in collisions of relativistic heavy ions. Study of the influence of color forces on the dynamics of parton interactions.
  
  Study of the impact of strong electromagnetic fields (occurring during relativistic heavy-ion collisions) on the character of background gluon fields and the formation of a heterophase mixed hadron system within the domain model of the QCD vacuum. Investigation of observable manifestations of azimuthal anisotropy of the gluon fields in the collision region.
  
  Study of the thermodynamic properties of non-uniform quark ensembles (quark droplets) on the basis of models with four-fermion interaction. The Keldysh model (featuring an infinite correlation length) will receive special attention.
  
  Further development of effective models for the QCD phase diagram to exhibit further observables (mesonic correlation functions, condensates and dual condensates) ready for comparison with lattice QCD data. Extension of PNJL and PQM models to include baryonic degrees of freedom to describe the region on non-vanishing net-baryon density.
  
  Study of hybrid EoS (equations of state) based on ab-initio nuclear EoS and non-local PNJL models in a wide range of densities, temperatures and isospin asymmetry, for applications in the simulation of heavy-ion collisions, of supernova collapse and in compact star phenomenology.
  
  

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