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O. V. Utyuzh

Publications and source records attributed to O. V. Utyuzh.

At least 19 recordsLinked to original sources
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

Multiparticle production processes from the Information Theory point of view

We look at multiparticle production processes from the Information Theory point of view, both in its extensive and nonextensive versions. Examples of both symmetric (like pp or AA) and asymmetric (like pA) collisions are considered showing that some ways of description of experimental data used in the literature are of more general validity than usually anticipated.}

hep-ph↗
arXiv2006

Quantum Clan Model description of Bose Einstein Correlations

We propose a novel numerical method of modelling Bose-Einstein correlations (BEC) observed among identical (bosonic) particles produced in multiparticle production reactions. We argue that the most natural approach is to work directly in the momentum space in which the Bose statistics of secondaries reveals itself in their tendency to bunch in a specific way in the available phase space. Because such procedure is essentially identical to the clan model of multiparticle distributions proposed some time ago, therefore we call it the Quantum Clan Model.

hep-ph↗
arXiv2005

Proposition of numerical modelling of BEC

We propose extension of the numerical method to model effect of Bose-Einstein correlations (BEC) observed in hadronization processes which allows for calculations not only correlation functions $C_2(Q_{inv})$ (one-dimensional) but also corresponding to them $C_2(Q_{x,y,z})$ (i.e., three-dimensional). The method is based on the bunching of identical bosonic particles in elementary emitting cells (EEC) in phase space in manner leading to proper Bose-Einstein form of distribution of energy (this was enough to calculate $C_2(Q_{inv})$). To obtain also $C_2(Q_{x,y,z})$ one has to add to it also symmetrization of the multiparticle wave function to properly correlate space-time locations of produced particles with their energy-momentum characteristics.

hep-ph↗
arXiv2005

Bose-Einstein correlations from "within"

We describe an attempt to model numerically Bose-Einstein correlations (BEC) from "within", i.e., by using them as the most fundamental ingredient of some Monte Carlo event generator (MC) rather than considering them as a kind of (more or less important, depending on the actual situation) "afterburner", which inevitably changes original physical content of the MC code used to model multiparticle production process.

hep-ph↗
arXiv2004

Numerical modelling of quantum statistics in high-energy physics

Numerical modelling of quantum effects caused by bosonic or fermionic character of secondaries produced in high energy collisions of different sorts is at the moment still far from being established. In what follows we propose novel numerical method of modelling Bose-Einstein correlations (BEC) observed among identical (bosonic) particles produced in such reactions. We argue that the most natural approach is to work directly in the momentum space of produced secondaries in which the Bose statistics reveals itself in their tendency to bunch in a specific way in the available phase space. Fermionic particles can also be treated in similar fashion.

hep-ph↗
arXiv2004

Multiparticle production processes from the nonextensive point of view

We look at multiparticle production processes from the nonextensive point of view. Nonextensivity means here the systematic deviations in exponential formulas provided by the usual statistical approach for description of some observables like transverse momenta or rapidity distributions. We show that they can be accounted for by means of single parameter q with |q-1| being the measure of nonextensivity. The whole discussion will be based on the information theoretical approach to multiparticle processes proposed by us some time ago.

hep-ph↗
arXiv2004

Bose-Einstein correlations in the Quantum Clan Approach

We propose novel numerical method of modelling Bose-Einstein correlations (BEC) observed among identical (bosonic) particles produced in multiparticle production reactions. We argue that the most natural approach is to work directly in the momentum space in which Bose statistics of secondaries reveals itself in their tendency to bunch in a specific way in the available phase space. Because such procedure is essentially identical to the clan model of multiparticle distributions proposed some time ago, therefore we call it the Quantum Clan Model.

hep-ph↗
arXiv2004

Multiplicity fluctuations in high energy hadronic and nuclear collisions

The showers of cosmic rays entering the Earth's atmosphere are main sources of information on cosmic rays and are also believed to provide information on elementary interactions at energies not accessible to accelerators. In this context we would like first to remind the role of inelasticity K and elementary cross section $σ$ and then argue that similar in importance are fluctuations of different observables. The later will be illustrated by multiplicity fluctuations in hadronic and nuclear collisions.

hep-ph↗
arXiv2003

How to model BEC numrically?

The new method of numerical modelling of Bose-Einstein correlations observed in all kinds of multiparticle production processes is proposed.

hep-ph↗
arXiv2003

Single particle spectra from information theory point of view

It is demonstrated how to obtain the least biased description of the single particle spectra measured in all multiparticle production processes by using information theory approach (known also as MaxEnt approach). The case of e+e- annihilation in hadrons process is discussed in more detail as an example. Comparison between MaxEnt approach and simple dynamical model based on the cascade process is presented as well.

hep-ph↗
arXiv2003

Information theory approach (extensive and nonextensive) to high energy multiple production processes

We present an overview of information theory approach (both in its extensive and nonextensive versions) applied to high energy multiparticle production processes. It will be illustrated by analysis of single particle distributions measured in proton-proton, proton-antiproton and nuclear collisions. We shall demonstrate the particular role played by the nonextensivity parameter q in such analysis as summarizing our knowledge on the fluctuations existed in hadronizing system.

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

Estimating the inelasticity with the information theory approach

Using the information theory approach, in both its extensive and nonextensive versions, we estimate the inelasticity parameter $K$ of hadronic reactions together with its distribution and energy dependence from $p\bar{p}$ and $pp$ data. We find that the inelasticity remains essentially constant in energy except for a variation around $K\sim 0.5$, as was originally expected.

hep-ph↗