M. Suleymanov

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 into 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 inner cone protons are leading particles.

The nuclear transparency effect of π−-mesons in p+12C- and d+12C-interactions at 4.2A GeV/c

The use of the nuclear transparency effect of π−-mesons in a proton and deuteron-induced interactions with carbon nuclei at 4.2A GeV/c, to obtain information on the properties of nuclear matter, is presented in this work. The half angle (θ1/2) technique is used to extract information on the nuclear transparency effect. θ1/2 divides the multiplicity of charged particles into two equal parts depending on their polar angle in the laboratory frame in pp interactions. Particles with an angle smaller than (incone particles) and greater than (outcone particles) θ1/2 are considered separately. The average values of multiplicity, momentum and transverse momentum of the π−-mesons are analyzed as a function of a number of identified protons in an event. We observed evidences in the data which could be considered as the transparency effect. For quantitative analysis, the results are compared with the cascade model. The observed effects are categorized into leading effect transparency and medium effect transparency. The transparency in the latter case could be the reason for the collective interactions of grouped nucleons with the incident particles.

Average characteristics of π−-mesons in HeC and CC interactions at high energies

The study of average characteristics of π−-mesons in Helium–Carbon and Carbon–Carbon interactions at 4.2A GeV/c is presented. The average values of multiplicity, momentum and transverse momentum of π−-mesons are analyzed as a function of the number of identified protons in an event. The latter is used to fix the centrality of collisions. The results are compared with Cascade model and modified Fritiof model. Some deviations of experimental data are observed than the models, which could be connected to collective interaction of inner nucleus nucleons.

Transverse momentum distribution of primary charged particles in the

The shape of the transverse momentum (pT) distribution of primary charged particles in minimum bias (nonsingle-diffractive) p–Pb collisions at sNN = 5.02TeV is studied in the pseudorapidity regions: |η| < 0.3, 0.3 < η < 0.8 and 0.8 < η < 1.3 and in the transverse momentum range 0.5 < pT < 20GeV/c using simulated data produced with the HIJING 1.0 code. These are compared with the ALICE data measured by the ALICE detector at the LHC. In the model, the central and forward η-regions differ more than in the ALICE data and due to this fact HIJING 1.0 cannot describe well the high pT region in the pT distributions. The comparison of results from simulation implies that the HIJING 1.0 considered narrower pseudorapidity distribution for the charged particles than it is in the ALICE data. It cannot take into account satisfactorily leading effect due to the asymmetric p–Pb fragmentation.

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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.

–Pb interactions using HIJING 1.0

The pseudorapidity spectra of fast particles (with β > 0.7) produced in Au (at 11.6 A GeV) and Pb (at 158 A GeV) induced collisions with emulsion (Em) nuclei contain some visual plateaus and shoulders. The plateau is wider for Pb+Em reactions compared with the Au+Em ones. The existence of a plateau is expected for parton models. The Fourier transformation and maximum entropy methods were used to get additional information about the plateaus. The dependence of the plateaus on the centrality of the collisions was also studied using the number of g-particles to fix centrality. It shows that the maximum entropy method could confirm the existence of the plateau and the shoulder on distributions.

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

We argue that

Analysis of shower particle pseudorapidity spectra in interactions of relativistic Au and Pb ions with emulsion nuclei

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The meaning behind observed pT regions at the LHC energies

distribution data from the LHC on the invariant differential yield of the charged primary particles in

Search for a signal on QCD critical point in central nucleusnucleus collisions

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