arXiv subjects

M. K. Suleymanov

Publications and source records attributed to M. K. Suleymanov.

At least 19 recordsLinked to original sources

arXiv2018

The collective behavior of the partons and its influence on the jet suppression in heavy ion collisions

We discuss the physical picture that a parton interaction with a coherent group of partons can lead to more jet quenching effect in the hot and dense matter created by heavy ion collisions at RHIC and LHC energies. We came to this picture after analyzing the behaviour of the nuclear modification factor as a function of $p_T$ for the charged particles produced in the most central Pb-Pb collisions at 2.76 A TeV. In the interval, $7-50 GeV/c$ the values of the factor as a function of $p_T$ increases almost linearly with a slope is very close to expected one for the inverse Compton effect. Around $p_T\simeq 60$ GeV/c, a regime change occurs, which is characteristic for the phenomenon. We propose that this similarity can be explained by the inverse Compton effect for partons, which occurs via a collective parton group formation ( through the appearance of a new string as a result of the fusion of strings) and its interactions with single partons in the interval of $5 < p_T < 10 GeV/c$. In the case of a coherent collision with a parton that has a lower energy than the group, the parton can gain energy through the inverse Compton effect, resulting in its acceleration and shifting to the region of $p_T >10$ GeV/c. After losing a significant part of its energy new string will decay into partons with lower energies - slowed partons in the interval of $p_T < 5 GeV/c$. This enhancement in the jet quenching can be observed in the interval of $2 <p_T <20 GeV/c$.

nucl-ex↗

arXiv2017

The meaning behind observed $p_T$ regions at the LHC energies

We argue that $p_T$ distribution data from the LHC on the invariant differential yield of the charged primary particles in $pp$ collisions at $\sqrt{s}=0.9 TeV, 2.76 TeV,7TeV$ and in $Pb-Pb$ collisions at $\sqrt{s_{NN}}=2.76 TeV$ with 6 centrality bins contains several $p_T$ regions with special properties. These distributions were analysed by fitting the data with exponential functions. We conclude that the regions reflect features of fragmentation and hadronization of partons through the string dynamics. The nuclear transparency results in negligible influence of the medium in the III region ($p_T >17-20 GeV/c$), which has highest $p_T$ values. The effects and changes by the medium start to appear weakly in the II region ($4-6 GeV/c < p_T< 17-20 GeV/c$) and become stronger in the I region ($p_T <4-6 GeV/c$) . It seems that the II region has highest number of strings. The increase in string density in this region could lead to fusion of strings, appearance of a new string and collective behaviour of the partons in the most central collisions. These phenomena can explain anomalous behaviour of the Nuclear Modification Factor in the II region. We propose the II region as a possible area of Quark Gluon Plasma formation through string fusion. The first $p_T$ regions are the ones with the maximum number of hadrons and minimum number of strings due to direct hadronization of the low energy strings into two quark systems - mesons.

nucl-ex↗

arXiv2015

The study of light nuclei production in different interactions at 4.2 AGeV/c

Average multiplicity of light nuclei produced in different interactions at 4.2A GeVc is studied as a function of centrality. A change in multiplicity is observed with increase in the mass of projectile. In 12CC-interactions an unexpected increase in the multiplicity is seen for the most central events. These measurements are compared with the predictions of Cascade and Fritiof Models which fail to account for the experimentally observed effects. In case of 12CC it is suggested that the inclusion of nuclear coalescence effect can be an explanatory reason for the differences between the experimental measurements and the models predictions.

nucl-ex↗

arXiv2013

Study of some characteristics of protons using interactions of light nuclei

Behavior of some average characteristics of protons are studied in protons and deuterons induced interactions with carbon nuclei at 4.2 A GeV/c. The emitted particles are divided in two groups depending on their polar angle in the lab. frame using half angle technique. Results of the experimental data are compared with Dubna version of cascade model. Analysis of the results show that the incone protons are leading particles.

nucl-ex↗

arXiv2013

Study of the behavior of nuclear modification factor in freeze-out state

One of the latest trends in the advancement of experimental high-energy physics is to identify the quark gluon plasma (QGP) predicted qualitatively by quantum chromodynamics (QCD). We discuss whether nuclear transparency effect which is considered an important phenomenon, connected with dynamics of hadron-nuclear and nuclear-nuclear interactions could reflect some particular properties of the medium. FASTMC is used for Au-Au collision at RHIC energies. Critical change in the transparency is considered a signal on the appearance of new phases of strongly interacting matter and the QGP.

nucl-ex↗

arXiv2013

Observation of light nuclei formation as nuclear coalescence in CC-interactions at 4.2 AGeV/c

The average multiplicity of light nuclei and pi-mesons, emitted in HeC and CC interactions at 4.2 A GeV/c were studied as a function of number of identified protons. In both interactions, the behavior of average multiplicity of pi- mesons are in agreement with results coming from the Cascade model. The model could not describe the behavior of average multiplicity of light nuclei produced in HeC interactions. In case of CC interactions the model could describe qualitatively the behavior of the average multiplicity of light nuclei. An essential deviation was observed in some of the most central events. We believe that nuclear coalescence effect may be a reason of this deviation.

nucl-ex↗

arXiv2012

Searching for the properties of nuclear matter using proton-carbon and deuteron-carbon collisions at 4.2 a gev/c

The present work reports the use of nuclear transparency effect of protons in proton and deuteron carbon interactions at 4.2 A GeV/c to get information about the states of nuclear matter. The half angle technique is used to extract the information on nuclear transparency. The results are compared with Dubna version of Cascade model. The average values of multiplicity, momentum and transverse momentum of protons are analyzed as a function of the number of identified protons in an event. We observed some evidence and trends in the data which could be considered as transparency effect. Analysis of the results shows that the leading effect is the basis of the observed transparency. Some contribution to the observed effect could be the existing short range correlations and the scaling power law s^-N, for exclusive two body hard scattering.

nucl-ex↗

arXiv2012

Nuclear Transparency Effect in the Strongly Interacting Matter

We discuss that the results of study of the nuclear transparency effect in nuclear-nuclear collisions at relativistic and ultrarelativistic energies could help to extract the information on new phases of the strongly interacting matter as well as the QCD critical point. The results could provide further confirmation of the existence of the "horn" effect which had initially been obtained for the ratio of average values of K+ to pi+ -mesons' multiplicity as a function of the initial energies in the NA49 SPS CERN experiment. To observe the "horn" as a function of centrality, the new more enriched experimental data are required. The data which are expected from NICA/MPD JINR and CBM GSI setups could fulfill the requirement.

nucl-ex↗

arXiv2012

Nuclear Transparency in the lightest nuclear interactions

Some experimental results on nuclear transparency effect in pC- and dC-interaction at 4.2 A GeV/c (JINR Dubna) are presented. The "half angle" (θ1/2) technique was used and the particles with emission angle greater and less than θ1/2 are considered separately. The results of the experimental study have been compared with the simulation data coming from the Dubna Cascade model. The values of average multiplicity, average momentum, and average transverse momentum of charged pions and protons are analyzed as a function of the number of identified protons in an event. We observed some behaviors for the data which could be considered as some nuclear transparency effects. The lasts have been divided into three main groups depending on their probable behavior: leading effect; cascade effect; medium effect.

nucl-ex↗

arXiv2011

Collective behaviour of partons could be a source of energetic hadrons

We discuss the idea that collective behaviour of the quarks/partons, which has been intensely discussed for the last 40 years in relativistic hadron-nuclear and nuclear-nuclear interactions and confirmed by new data coming from the ultrarelativistic heavy ion collisions, can lead to energetic particle production. Created from hadronization of the quark/parton (or quarks/partons), energetic particles could get the energy of grouped partons from coherent interactions. Therefore, we think that in the centre of some massive stars, a medium with high density, close to Quantum Chromodynamic one could be a source of the super high-energy cosmic rays.

physics.gen-ph↗

arXiv2011

Pseudorapidity spectra of relativistic particles emitted in the Au and Pb induced reactions at high energies

The structure of the pseudorapidity spectra of charged relativistic particles with beta > 0.7 measured in Au+Em and Pb+Em collisions at AGS and SPS energies are analyzed using Fourier transformation method and maximum entropy one. The dependences of these spectra on the number of fast target protons (g-particles) are studied. They show visually some plateau and "shoulder" which are at least three selected points on the distributions. The plateau seems wider in Pb+Em reactions. The existing of plateau is expected for the parton models. The maximum entropy method confirms the existence of the plateau and the shoulder of the distributions.

nucl-ex↗

arXiv2011

Search for a Signal on Phase Transitions of Strongly Interacting Matter using the Nuclear Transparency Effect

We discuss that the results coming from the central experiments confirm the results which had been obtained for the behavior of the K+-meson's temperature behavior as a function of the energy in SPS energy range. To see the "horn" for the behavior of the ratio for average values of K+- to pi+- mesons as a function of centrality the new more rich experimental data are required. The data can be obtained with NICA/MPD setup. The existing of the QCD critical point could be identified by using the nuclear transparency effect as a function of the centrality.

nucl-ex↗

arXiv2009

Analysis of nucleus-nucleus collisions at high energies and Random Matrix Theory

We propose a novel statistical approach to the analysis of experimental data obtained in nucleus-nucleus collisions at high energies which borrows from methods developed within the context of Random Matrix Theory. It is applied to the detection of correlations in momentum distributions of emitted particles. We find good agreement between the results obtained in this way and a standard analysis based on the method of effective mass spectra and two-pair correlation function often used in high energy physics. The method introduced here is free from unwanted background contributions.

nucl-ex↗

arXiv2009

Comparison of experimental and theoretical results to define centrality of heavy ion collisions

Using the simulation data coming from the cascade model, we have studied the behavior of event number as a function of impact parameter-b and a number of all charged particles- Nch for light and heavy nuclei at different energies. We have seen that for light nuclei, a number of all charged particles-Nch could be used to fix the centrality. But for heavy nuclei we have got strong initial energy and mass dependences and the results for impact parameter factor dependences and ones for a number of all charged particles differ. So for heavy nuclei, a number of charged particles-Nch could not be use to fix the centrality. Key words: cascade model; centrality, light nuclei, heavy nuclei

nucl-ex↗

arXiv2009

Some properties of the central heavy ion collisions

Some experimental results are discussed in connection with the properties of the central heavy ion collisions. These experiments indicate the regime changes and saturation at some values of the centrality. This phenomenon is considered to be a signal of the percolation cluster formation in heavy ion collisions at high energies. Keywords: heavy ion collisions, theoretical models, centrality, phase transition.

nucl-ex↗

arXiv2009

Light nuclei production in heavy ion collisions

Light nuclei production as a result of nuclear coalescence effect can give some signals on final state of Quark Gluon Plasma formation. We are studying the behavior of nuclear modification factor as a function of different variables using the simulated data coming from the FASTMC generator. This data is necessary to extract information on coalescence mechanism from experimental data on high energy nuclear-nuclear interactions.

nucl-ex↗

arXiv2009

Study of the behavior of the nuclear modification factor in freeze-out state

We have studied the behaviour of the nuclear modification factor as a function of centrality, chemical baryon potential and thermal freeze out temperature using the data coming from the Fast Hadron Freezeout Generator. Considering two ways of NMF definition, namely the ratio of meson yields and ratio of baryons yield, we considered two associates effects (for percolation cluster formation) to identify it; appearance of the anomalous nuclear transparency and light nuclei production. In this paper we have used the behaviour of nuclear modification factor as a function of different physical parameters to get the information of the behavior of nuclear transparency effect and the nuclear coalescence in freezeout state. We have chosen different generators for this purpose. Here we have used the simulated data for Au-Au collisions at RHIC energies coming from the FASTMC Model. This model is very good in freezeout state.

nucl-ex↗

arXiv2009

Some Properties of the Central pi--Meson Carbon Interactions at 40 Gev/C

We discuss some properties of the central pi--meson carbon reactions at 40 GeV/c. While these results were obtained many years ago they have not been explained completely. We attempt to interpret following: results regime change on the behavior of some characteristics of the events as a function of the centrality; anomaly peak on the angular distributions of the slow protons emitted in these reactions; charge asymmetry on the pi--mesons production in the back hemisphere in lcs. Understanding of the results could help to explain the new ones coming from the modern central experiments at high and ultrarelativistic energies.

hep-ex↗