arXiv subjects

G. A. Kozlov

Publications and source records attributed to G. A. Kozlov.

At least 37 records · Page 2Linked to original sources

arXiv2010

Two-Photon Correlations in $pp$ Collisions

It is well understood that the studies of correlations between produced particles, the effects of coherence and chaoticity, an estimation of particle emitting source size play an important role in high energy physics [1]. First of all, we mean the investigation of the space-time extension or even squeezing of particle sources via the multiparticle quantum-statistics correlation. We consider the two-photon correlation function that can provide the space-time information about the Higgs-boson source in thermal environment and estimate the Higgs-boson mass for the first time.

hep-ph↗

arXiv2010

BEC of Two Photons and Higgs Physics

It is well understood that the studies of correlations between produced particles, the effects of coherence and chaoticity, an estimation of particle emitting source size play an important role in high energy physics [1]. We mean the investigation of the space-time extension or even squeezing of particle sources via the multiparticle quantum-statistics correlation. We obtain the two-photon correlation function that can provide the space-time information about the Higgs-boson source in thermal environment and we argue that such an investigation could probe the Higgs-boson mass.

hep-ph↗

arXiv2010

LHC signatures of unparticles in decays of $Z^{\prime}$

We investigate the rare radiative decays of extra gauge neutral bosons. In particular, we established the theoretical predictions for the production of unparticle in decays of $Z^{\prime}$ - bosons. The implementation of our prediction in the analysis at the LHC experiments should be straightforward and lead to more precise determination or limits of unparticle couplings and/or $Z^{\prime}$ couplings and masses.

hep-ph↗

arXiv2009

Comments on gauge unparticles

A field model for a quark and an antiquark binding is described. Quarks interact via a gauge unparticle ("ungluons"). The model is formulated in terms of Lagrangian which features the source field $S(x)$ which becomes a local pseudo-Goldstone field of conformal symmetry - the pseudodilaton mode and from which the gauge non-primary unparticle field is derived by $B_μ(x) \sim\partial_μ S(x)$. Because the conformal sector is strongly coupled, the mode $S(x)$ may be one of new states accessible at high energies. We have carried out an analysis of the important quantity that enters in the "ungluon" exchange pattern - the "ungluon" propagator.

hep-ph↗

arXiv2009

Gauge model of unparticles

Modern theoretical models strongly suggest that new phenomena await discovery above the energy scale of the Standard Model (SM) of particle interactions. In this paper we argue that correct description of particle physics in the TeV energy scale needs to account for degrees of freedom obeying the conformal (or scale) invariance. In this respect, the existing of Georgi's unparticles is strongly argued. We present the gauge model of scalar unparticles. The ground state of scalar unparticles in the continuum is restricted by the vacuum expectation value of the SM Higgs boson and the scale dimension $d$. In the framework of Abelian gauge field theories we develop a model in four-dimensional space-time in which the scalar unHiggs is a dipole field. The quantization is performed within the canonical formalism. Based on general principles of quantum field theory the new features of unHiggs propagators are carried out for the first time.

hep-ph↗

arXiv2008

Bose-Einstein correlations of neutral gauge bosons in $pp$ collisions

The theory for Bose-Einstein correlations in case of neutral gauge bosons in $pp$ collisions at high energies is presented. Based on quantum field theory at finite temperature the two-particle Bose-Einstein correlations of neutral gauge bosons are carried out for the first time. As a result, the important parameters of the correlation functions can be obtained for the $Z^{0}Z^{0}$ pairs. The correlations of two bosons in 4-momentum space presented in this paper offer useful and instructive complimentary viewpoints to theoretical and experimental works in multiparticle femtoscopy and interferometry measurements at hadron colliders.

hep-ph↗

arXiv2008

The flux-tube phase transition and bound states at high temperatures

We consider the phase transition in the dual Yang-Mills theory at finite temperature $T$. The phase transition is associated with a change (breaking) of symmetry. The effective mass of the dual gauge field is derived as a function of $T$-dependent gauge coupling constant. We investigate the analytical criterion constraining the existence of a quark-antiquark bound state at temperatures higher than the temperature of deconfinement.

hep-ph↗

arXiv2008

Bose-Einstein correlations and the stochastic scale of light hadrons emitter source

Based on quantum field theory at finite temperature we carried out new results for two-particle Bose-Einstein correlation (BEC) function ${C_2}(Q)$ in case of light hadrons. The important parameters of BEC function related to the size of the emitting source, mean multiplicity, stochastic forces range with the particle energy and mass dependence, and the temperature of the source are obtained for the first time. Not only the correlation between identical hadrons are explored but even the off-correlation between non-identical particles are proposed. The correlations of two bosons in 4-momentum space presented in this paper offer useful and instructive complimentary viewpoints to theoretical and experimental works in multiparticle femtoscopy and interferometry measurements at hadron colliders. This paper is the first one to the next opening series of works concerning the searching of BEC with experimental data where the parameters above mentioned will be retrieved.

hep-ph↗

arXiv2007

Some forgotten features of the Bose Einstein Correlations

Notwithstanding the visible maturity of the subject of Bose-Einstein Correlations (BEC), as witnessed nowadays, we would like to bring to ones attention two points, which apparently did not received attention they deserve: the problem of the choice of the form of $C_2(Q)$ correlation function when effects of partial coherence of the hadronizing source are to be included and the feasibility to model effects of Bose-Einstein statistics, in particular the BEC, by direct numerical simulations.

hep-ph↗

arXiv2006

The flux-tube phase transition

We consider the phase transition in the "hot" dual long-distances Yang-Mills theory at finite temperature $T$. This phase transition is associated with a change of symmetry. The dual model is formulated in terms of two-point Wightman functions with equations of motion involving higher derivatives. The effective mass of the dual gauge field is derived as a function of $T$-dependent gauge coupling constant.

hep-ph↗

arXiv2005

BEC and the particle mass

We derive new features of Bose-Einstein correlations by means of Quantum Field Theory at finite temperature, supplemented by operator-field evolution approach. The origin of the dependence of the measured two-particle correlation function (as well as the so-called correlation radius) on the particle mass has received its correct explanation. The lower bound on the particle emitting source size is estimated.

hep-ph↗

arXiv2005

Bose-Einstein correlations at LEP and Tevatron energies

Using the Bose-Einstein correlations (BEC) implemented in PYTHIA we investigated a possibility of the CDF experiment at the Tevatron to see the two-particle correlations in the final state of interactions. The approach based on quantum field theory at finite temperature was applied to the ALEPH data at LEP, and the BEC important parameters were retrieved.

hep-ph↗

arXiv2005

On leptonic decay of a heavy quarkonium with a Higgs-boson emission

A leptonic $(\bar l l)$ decay of a heavy quark-antiquark bound state $T(\bar QQ)$ with a Higgs-boson $H$ emission is investigated. The applying of the well-known low-energy theorem to meson-Higgs coupling allows one to estimate the probability of the decay $T(\bar QQ)\to \bar ll H$. The only a simple version of the Standard Model extension containing two-Higgs doublet is considered.

hep-ph↗

arXiv2005

New features of two-particle correlations

We show that a recently proposed derivation of Bose-Einstein correlations (BEC) by means of thermal Quantum Field Theory, supplemented by operator-field evolution of Langevin type, allows a deeper understanding of a possible coherent behaviour of the emitting source and a clear identification of the origin of the observed shape of the 2-particle BEC function $C_2(Q)$. We explain the origin of the dependence of the measured correlation radius on the hadron mass. The lower bound of the particle source size is estimated.

hep-ph↗

arXiv2005

On radiative decay of $Z^{\prime}$ boson

In the framework of the extended $SU(2)_{h}\times SU(2)_{l}$ model we study the radiative decay of an extra gauge boson $Z^{\prime}$, $Z^{\prime}\toγZ$. The data analysis results of the CDF collaboration at the Fermilab Tevatron allow one to establish not only the lower bound of the decay probability $Z^{\prime}\toγZ$ normalized to Drell-Yan process $Z^{\prime}\to μ^{+}μ^{-}$, $R(Z^{\prime}\toγZ/μ^{+}μ^{-})> 1.4\times 10^{-5}\cot^{2}ϕ$, but also to estimate the mixing angle $ξ$ between the states $Z^{\prime}$ and $Z$, $|ξ| < 5\times 10^{-2}$, taking into account the additional mixing angle $ϕ$ related to the extended gauge group $SU(2)_{h}\times SU(2)_{l}$. The comparison with the decays $Z^{\prime}\toτ^{+}τ^{-}$ and $Z^{\prime}\to \bar b b$, $Z^{\prime}\to \bar t t$ based on the LEP data is also presented.

hep-ph↗

arXiv2003

The Bose-Einstein correlations from a Quantum Field Theory perspective

Using a specific version of thermal Quantum Field Theory (QFT), supplemented by operator-field evolution of the Langevin type, we discuss two issues concerning the Bose Einstein correlations (BEC): the origin of different possible coherent behaviour of the emitting source and the origin of the observed shape of the BEC function $C_2(Q)$. We demonstrate that previous conjectures in this matter obtained by other approaches are confirmed and have received complementary explanation.

hep-ph↗

arXiv2003

The Bose-Einstein correlation function $C_2(Q)$ from a Quantum Field Theory point of view

We show that a recently proposed derivation of Bose-Einstein correlations (BEC) by means of a specific version of thermal Quantum Field Theory (QFT), supplemented by operator-field evolution of the Langevin type, allows for a deeper understanding of the possible coherent behaviour of the emitting source and a clear identification of the origin of the observed shape of the BEC function $C_2(Q)$. Previous conjectures in this matter obtained by other approaches are confirmed and have received complementary explanation.

hep-ph↗

arXiv2003

Production of (super)heavy quarkonia and new Higgs physics at hadron colliders

Based on the two Higgs doublet model, we study the effect of Higgs-boson exchange on the (super)heavy quarkonium \bar QQ, which induces a strong attractive force between a (super)heavy quark Q and an antiquark \bar Q. An interesting application is the decay of (super)heavy quarkonia \bar QQ into a Higgs boson associated with gauge bosons. The criterion for making the \bar QQ bound state is studied. We also show that non-perturbative effects due to gluonic field fluctuations are rather small in such a heavy quark sector. Possible enhancement for productions and decays of \bar QQ bound states made from the fourth generation quark Q is discussed for \bar p p (at the Tevatron) and pp (at the LHC) collisions.

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