Light mesons tend to cluster near certain values of mass. It is interesting to notice that such a degeneracy can be described using dynamical $O(4)$-symmetry, like in the hydrogen atom. The meson mass spectrum can be well approximated by linear Regge trajectories of the kind $M^2=a l+b n_r+c$, where $l$ and $n_r$ are angular momentum and radial quantum number, and $a$, $b$, $c$ are...
In my talk I will review the hydrodynamical approach to the description of the gravitational chiral anomaly in spacetimes with a non-trivial Ricci tensor proportional to the cosmological constant (so-called Einstein manifolds) and discuss an alternative derivation of the Unruh effect in curved spacetime as a non-trivial consequence of the hydrodynamical description of the axial current.
Masses of the triply heavy tetraquarks of all flavor compositions are calculated within the relativistic quark model, based on the quasipotential approach and QCD. Tetraquark is treated as a bound state of the nonobservable non-pointlike diquark and antidiquark. The relativistic quasipotential equation takes into account all relativistic corrections (both spin--dependent and spin--independent)...
We show that there is a relationship between hydrodynamic effects in flat space and effects in a gravitational field. Moreover, this connection is valid at the quantum level in the case of quantum anomalies. In particular, we find in an accelerated and vortical medium a transport effect directly related to the gravitational chiral anomaly. The general theorem about this relationship is...
We revisit the production of vector portal mediators, dark photons with masses 0.4-1.8 GeV, via inelastic proton bremsstrahlung. For the first time, we add the contribution associated with the Pauli electromagnetic proton form factor and obtain new splitting functions according to the factorization procedure originally proposed by Altarelli and Parisi. We also demonstrate the significance of...
The cross sections for the production of single and paired dileptons in electron-positron annihilation are calculated within the framework of quantum electrodynamics. Both one-photon and two-photon mechanisms of electron-positron annihilation with subsequent production of leptons are considered. The formation of both singlet and triplet states of dimuonium and ditauonium is studied. The...
After a brief review of Gribov copy effects in Landau gauge we present recent results of studies of these effects in the Maximal Abelian gauge in lattice gluodynamics. In particular, we show that one can find Gribov copies with nice decomposition of the static quark potential into monopole and monopoleless components.
The study of theories related to experimental physics, such as supersymmetric gauge theories (SUSY QFT) and strongly correlated systems, is very important for modern science. String theory, particularly the AdS/CFT correspondence, is a key tool for these studies. It allows us to develop methods to study and create gauge field theories and understand non-Lagrangian operators through...
We extend the notion of color superconductivity for d-dimension AdS spacetime to find the condition of Nc to give the general diquarks condensate in d-1 dimension boundary which only use the Einstein Maxwell gravity in d-dimension. We find the relation between Nc and number of dimension of AdS spacetime.
The possibility of the lightest sterile neutrino with a mass of about a few keV as warm dark matter (DM) in the framework of the Minimal left-right symmetric model (MLRM) based on the SU(3)cSU(2)LSU(2)R*U(1) gauge group is considered. Only few parameters of the model are free which makes it rather predictable and unambiguous. We thoroughly consider a parametrization in the lepton sector and...
The study of the effective potential for non-renormalisable (super)symmetric models leads to recurrence relations for the leading singularities. These relations can be transformed into generalised renormalization-group (RG) equation which can be analyzed in detail. In some special cases this equation can be solved exactly.
The fluctuation of the number of charged particles in a given rapidity interval of observation was studied. Analytical expressions and the Monte Carlo modeling in the framework of a quark-gluon string model were used to calculate scaled and robust variance of the multiplicity in the case with string fusion and without it. The used distribution of primary strings in the transverse plane is...
This work focuses on the calculation of quark counting rules for the inclusive production of pions at large transverse momenta in the cumulative region—a kinematic domain forbidden for single nucleon-nucleon interactions. This region, which cannot be accessed through single nucleon-nucleon interactions, becomes relevant in nuclear collisions and can be observed using the MPD and SPD detectors...
The study of the associated production of $J/\psi$-mesons and
photons is very impotent to verify perturbative quantum
chromodynamics, factorization approaches, heavy quark to heavy
quarkonium hadronization models and to extracting the Parton
Distribution Function (PDF) of gluon in a proton from experimental
data. In this paper, we study the associated production of
$J/\psi$-mesons and photons...
Prompt heavy quarkonium production is well described within the collinear parton model in the next-to-leading order of perturbaive QCD at kinematical region of $p_T^{} \gg M$ where $M$ is a mass of a quarkonium state. But the region of small $p_T^{}$ is still being researched and the factorisation approach which is valid here is TMD-factorisation (transverse-momentum dependent). We studied...
The production of Mueller-Navelet dijets is studied within the framework of the
High-Energy Factorization approach [1,2,3]. Such processes are considered to be
sensitive to the effects of BFKL resummation [4]. In the Ref.[5] it was shown
that experimental data for dijets with large rapidity gaps can't be described
using NLO DGLAP based Monte-Carlo generators. In the study, we predict...
Neutrino propagation in Galactic and extragalactic magnetic fields is considered. We extend an approach developed in [1] to describe neutrino flavour and spin oscillations on astrophysical baselines using wave packets. The evolution equations for the neutrino wave packets in uniform and non-uniform magnetic fields are derived. The analytical expressions for neutrino flavour and spin...
In non-central A+A collisions, the measured azimuthal flow of particles is well understood in the paradigm of quark-gluon plasma formation. Namely, the initial spatial anisotropies in the intersection region of the overlap of two nuclei are transferred under large pressure gradients by the almost perfect liquid consisting of strongly coupled quarks and gluons to the momentum asymmetries of...
Elastic pp scattering at the invariant mass of the pp-system $\sqrt{s_{pp}}= 3 - 5$
GeV and large c.m.s. angles ($\theta_{cm}=90^\circ$) demonstrates a
very large double-spin correlation [1]. These kinematical region corresponds to very high momentum trasfer |t|
where quark counting rules are valid and color transparency is expected to be observed. On the other hand,
these energies...
Extensive air showers (EAS), produced by cosmic rays in the atmosphere, serve as probes of particle interactions, providing access to energies and kinematical regimes beyond the reach of laboratory experiments. Measurements from multiple cosmic-ray detectors indicate a significant, yet unexplained, discrepancy between the observed muon content in EAS and that predicted by state-of-the-art...
Generalized parton distributions (GPD) are being extensively used to describe hard exclusive hadron processes.
Twist-2 photon GPDs has been previously derived by calculation of the photon-photon electromagnetic scattering amplitude.
These distributions may give contribution to the ultraperipheral light-by-light processes in heavy ion collisions recently observed at the LHC.
New method of...
We study the stability of an intensive plane wave of a massless (or small mass) field due to the production of massive particles (a process which is perturbatively forbidden), in a toy model of two scalar fields. We apply two methods: first, we solve the Heisenberg equation for quantum amplitudes of produced massive field in case of arbitrary masses generalizing the solution of (see A.Arza...
We study electron-positron pair creation by strong electric field (the Schwinger effect), assisted by an electromagnetic plane wave of a weaker amplitude and keV energy range, and an additional high-energy (MeV) photon, by semiclassical worldline instanton approach. We show that the rate of the process is greater that in the absence of one of these three components. We compare the field...
The form factors parameterizing weak D and Ds transitions to orbitally and radially excited light mesons are calculated in the framework of the relativistic quark model based on the quasipotential approach. Special attention is paid to the systematic account of the relativistic effects including transformation of the final meson wave function from rest to moving reference frame and...
