Higher-order QCD predictions of charge asymmetry distributions are presented for inclusive W±+X→l±ν+X production in proton-proton (pp) collisions at 8, 13, and 14 TeV center-of-mass energies. The W boson or the decay lepton charge asymmetries constitute a direct probe of the relative u and d quark distributions in the proton as functions of the initial-state parton momentum fractions. The...
We investigate nonlinear response of the physical vacuum by the example of the third harmonic in radiation of the electron-positron-photon (EPP) plasma exciting by a strong time dependent electric field at the focus spot of counterpropagating laser pulses. The investigation was developed within the framework of the Bogoliubov-Born-Green-Kirkwood-Yvon kinetic theory [1,2] describing...
We consider dynamics of the massive minimally coupled scalar field theory in an expanding Friedmann-Lemaitre-Robertson-Walker universe. We consider the standard toy model of the conformally flat space-time where the conformal factor becomes constant at the distant past and the distant future. Employing Schwinger-Keldysh diagrammatic technique, we compute infrared loop corrections to the...
The lowest order radiative corrections to the lepton current in polarized SIDIS are calculated exactly. The contribution of exclusive radiative tail for polarized initial particles are estimated for the first time. Numerical analysis is performed in the frame of the modern JLab kinematic conditions within Wandzura-Wilczek model for SiDIS structure functions and the exclusive radiative tail is...
Free particles carrying orbital angular momentum (OAM) are called twisted particles. The wave function of such particles has a characteristic phase $e^{i l\varphi}$, where $l$ is the OAM projection onto the axis along the particle motion and $\varphi$ is the azimuth angle of a point of a wave packet in the cylindrical system of coordinates. The twisted neutrons have been obtained relatively...
We present new soliton solutions in a class of four-dimensional supergravity theories. For special values of the parameters, the solutions can be embedded in the gauged maximal N=8 theory and uplifted in the higher-dimensional D=11 theory. We also find BPS soliton configurations, preserving a certain fraction of supersymmetry.
Solitons play a special role in classical physics as well as in...
It has been shown that non-Abelian vortex string supported in four dimensional (4D) ${\mathcal N}=2$ supersymmetric QCD (SQCD) with the U(2) gauge group and $N_f = 4$ quark flavors becomes a critical superstring. This string propagates in the ten dimensional space formed by a product of the flat 4D space and an internal space given by a Calabi-Yau non-compact threefold, namely, the conifold....
Monopole condensation causes color confinement and instantons induce chiral symmetry breaking. Color confinement and chiral symmetry breaking are closely tied to one another through monopoles and instantons in the QCD vacuum. However, it is difficult to reveal the quantitative relations and effects among monopoles, instantons, color confinement, and chiral symmetry breaking by perturbative...
We consider oscillons - localized, quasiperiodic, and extremely long-living classical solutions in models with real scalar fields. We develop their effective description in the limit of large size at finite field strength. Namely, we note that nonlinear long-range field configurations can be described by an effective complex field $\psi(t,\mathbf{x})$ which is related to the original fields by...
In this work we explore the nonpertorbative corrections, especcialy operator dimension which is connected to existing of short strings, basing on our method: processing of experimental data on $e^+e^-$-annihilation into even number of pions (BaBar, CMD-2, OLYA) by constructing the Adler function in two ways (through dispersion representation and through the OPE series), applying the Borel...
The radiation of photons by electrons is investigated in the framework of quantum electrodynamics up to the second order in the coupling constant e. The N-particle, coherent, and thermal initial states are considered and the forms of the electron wave packets are taken into account. The explicit expressions for the intensity of radiation and the inclusive probability to record a photon are...
Using a nonperturbative approach based on the Cornwall-Jackiw-Tomboulis effective action Γ(S) for composite operators (S is the full fermion propagator), the phase structure of the (2 + 1)-dimensional Gross-Neveu (GN) and Thirring models is investigated. We have calculated Γ(S) and its stationary (or Dyson-Schwinger) equation for GN model and have shown that it has three different solutions...
We study the prompt single and double J/ψ hadroproduction in the Improved Color
Evaporation Model using the Parton Reggeization Approach. We make calculations in a single manner to described the experimental data for prompt J/ψ transverse momentum spectra from the energy of $\sqrt{s}$=19 GeV up to modern energy of the LHC, $\sqrt{s}$=13 TeV. The numerical calculations are made using...
A number of resonances compatible with a hypothesis of hidden-charm pentaquark was observed by the LHCb Collaboration. We interpret these narrow resonances as compact hidden-charm diquark-diquark-antiquark pentaquarks. Within this assumption, an interplay between the charmonium and open-charm modes is considered. Ratios of such modes is estimates for non-strange and strange pentaquarks are...
Masses of the ground and excited states of the fully-heavy tetraquarks, composed of charm $c$ and bottom $b$ quarks and antiquarks, are calculated in the diquark-antidiquark picture in the framework of the relativistic quark model based on the quasipotential approach and quantum chromodynamics. The quasipotentials of the quark-quark and diquark-antidiquark interactions are constructed...
We study the processes of the paired heavy meson and baryon production in electron-positron annihilation, gamma-gamma interaction and decays of the Higgs boson. Using the perturbative Standard Model and relativistic quark model we construct relativistic amplitudes and cross sections. Relativistic corrections connected with the relative momenta of heavy quarks are calculated in the production...
The processes with single top quark production provide a prototype search for the types of final state that are expected in many new physics scenarios. Some distinctive features are considered for particle production in the top sector in ultra-high energy domain which can be covered partly in the collisions of cosmic ray particles with atmosphere. The single top quark production through...
The interaction of neutrinos with photons at high energies is considered within the standard electroweak theory. It is pointed out that the theory admits the presence of resonant channels in the production of massive bosons in neutrino$-$photon reactions. Some consequences of the existence of such channels for scattering of neutrinos on atomic nuclei are discussed. In particular, we show the...
Spin Physics Detector (SPD) will be created at NICA accelerator facility in Dubna, Russia. One of the aims of the experiment is a study of spin effects in polarized proton-proton and deuteron-deuteron collisions at high energies. The other very important aim is an extraction of gluon distribution function of nucleons. Minimal bias interactions will be studied also. We will consider problems of...
Experimentally, correlations between multiplicity of charge particles and the mean transverse momentum were seen in $p+p$ collisions from the highest SPS energy to the LHC energy. The extension of the experimentally established pattern of the change from negative correlations at energies $\sqrt{s}$ = 17–40 GeV by measurements at lower energies is particularly significant [1]. This set of...
Phenomenological model of color quark-gluon strings as particle emitting sources [1] is developed and used to study correlations in rapidity of different event observables such as multiplicity and mean particle transverse momenta [2]. The color strings dynamics at initial stages of the relativistic collisions is considered both in rapidity dimension [3] and in transverse plane [4]. The former...
Multiple particle production in pp interactions at LHC energies is considered in a model with quark-gluon strings (color flux tubes) as sources, assuming the string cluster formation. Within this model multiplicity distributions of charged particles, their combinants and the properties of the strongly intense variable Σ, which characterizes the correlations between the number of particles in...
The calculation based on next-to-leading logarithm (NLL) approximation for Balitsky-Fadin-Kuraev-Lipatov (BKFL) evolution is discussed for Mueller-Navelet (MN) dijet production cross section as well as ratios of cross sections with veto as functions of rapidity separation $\Delta y$ between jets in dijet. The NLL BFKL calculations employ optimal renormalization scale procedure generalized for...
