arXiv subjects

G. L. Gogiberidze

Publications and source records attributed to G. L. Gogiberidze.

6 recordsLinked to original sources

arXiv1999

On coherent particle production in central 4.3 A Gev/c Mg-Mg collisions

Features of dense groups, or spikes, of negative pions produced in Mg-Mg collisions at 4.3 GeV/c/nucleon are studied to search for a coherent, Cerenkov-like, mechanism of particle production process. We investigate the distributions of spike centers and, for the first time, the energy spectra of particles in spikes. The spike-center distributions are obtained to exhibit the structure due to the coherent gluon-jet emission dynamics. This structure is similar to that observed recently for all-charged-particle spikes in hadronic and nuclear interactions. The energy distribution within spikes is found to have a significant peak over the inclusive background, while the inclusive spectrum shows exponential decrease with two characteristic values of average kinetic energy. The value of the peak energy and its width are in a good agreement with those expected for pions produced in a nuclear medium in the framework of the Cerenkov quantum approach. The peak energy obtained is consistent with the value of the cross-section maximum observed in coincidence experiments of nucleon-nucleus interactions.

hep-ph↗

arXiv1998

Coherency vs. Stochasticity in Spike Production in Nuclear Collisions at Intermediate Energies

Multiparticle spike-production process is investigated in central C-Cu collisions at 4.5 $A$ Gev/c per nucleon. The study is based on two different hypotheses - stochastic vs. coherent - of the formation of spikes. To observe manifestations of the stochastic dynamics, the non-regularities in the multiplicity distributions are analyzed using intermittency approach to a possible phase transition as well as the one-dimensional intermittency model. The entropy indices are calculated based on the erraticity approach. Coherency is studied in the framework of the coherent gluon-jet radiation model. To this end, the spike-center pseudorapidity distributions are analyzed. Coexistence of the two mechanisms of spike formation process is discussed.

hep-ph↗

arXiv1998

Study of Multiparticle Spikes in Central 4.5A GeV/c C-Cu Collisions

An analysis of local fluctuations, or spikes, is performed for charged particles produced in central C-Cu collisions at 4.5 GeV/$c$/nucleon. The distributions of spike-centers and the maximum density distributions are investigated for different narrow pseudorapidity windows to search for multiparticle dynamical correlations. Two peaks over statistical background are observed in the spike-center distributions with the structure similar to that expected from the coherent gluon radiation model and recently found in hadronic interactions. The dynamical contribution to maximum density fluctuations are obtained to be hidden by statistical correlations, though behavior of the distributions shows qualitative agreement with that from the one-dimensional intermittency model. The observed features of the two different approaches, coherent vs. stochastic, to the formation of the local dynamical fluctuations are discussed.

hep-ph↗

arXiv1998

Study of Fractality and Chaoticity in Central 4.5A GeV/c C-Cu Collisions

Multifractality of charged particle pseudorapidity distributions is analyzed in central collisions of carbon and copper nuclei at 4.5 GeV/c per nucleon. Within the method of normalized factorial moments, modified to remove the bias of infinite statistics in the normalization, intermittency-like behavior (scaling) is observed up to eight-particle fluctuations. The study indicates a possible non-thermal phase transition inside cascading and two different regimes presented in multiparticle production. Dynamics of fractal structure formation is further studied using the chaoticity approach recently proposed. The distributions of the horizontal factorial moments are considered and a scaling behavior, referred to as erraticity, of the normalized moments of the distributions is obtained. The corresponding entropy indices are calculated indicating chaotic nature of multiparticle production with a specific self-similar structure.

hep-ph↗

arXiv1996

On Dynamics of Fractality in Central C-Cu Collisions at 4.5A Gev/c

Fractal structure of charged particle distributions in the pseudorapidity and transverse momentum in central C-Cu collisions at 4.5A GeV/c is studied by means of intermittency approach and multifractal analysis. The modifications to take into account statistical bias are applied. Intermittency study in the pseudorapidity phase space indicates a non-thermal phase transition and different regimes of multiparticle production. Multifractality is observed within the both methods applied. The interrelation of the methods using the effective average multiplicity approach is studied. The findings support the idea of statistical significance of influence of finite multiplicities. In the transverse momentum spectrum no dynamical fluctuations are found.

hep-ph↗

arXiv1994

On dynamics of pseudorapidity fluctuations in central C--Cu collisions at 4.5~A GeV/c

Results on dynamical fluctuations of charged particles in the pseudorapidity space of central C--Cu interactions at 4.5 $A$ GeV/$c$ are performed in the transformed variables and using higher order scaled factorial moments modifyied to remove the bias of infinite statistics in the normalization. The intermittency behavior is found up to eighth order of the moments increasing with the order and leading to the pronounced multifractality. Two differed intermittent-like rises are obtained, one indicating an occurrence of the non-thermal phase transition, and no critical behavior is found to be reached in another case. The observations may be treated to show different regimes of particle production during the cascade. Comparison with some conventional model approximations notes the multiparticle character of the fluctuations. The results presented can be effective in sense of sensitivity of intermittency to the hadronization phase.

hep-ph↗