Please use this identifier to cite or link to this item: http://prr.hec.gov.pk/jspui/handle/123456789/16030
Title: Transverse Momentum and Rapidity Spectra of Negative Pions in Nucleus-Nucleus Collisions at 4.2 GeV/c Per Nucleon
Authors: Iqbal, Akhtar
Keywords: Physical Sciences
Physics
Issue Date: 2020
Publisher: International Islamic University, Islamabad.
Abstract: Transverse Momentum and Rapidity Spectra of Negative Pions in Nucleus-Nucleus Collisions at 4.2 GeV/c Per Nucleon In the present analysis, it was studied the characteristics of π-mesons in AA collisions at 4.2AGeV/c. In nucleus-nucleus interactions, it was analyzed the dependencies of characteristics of the charged pions at 4.2AGeV/c on collision centrality. There was a noticeable change in the average kinematical characteristics of the charged pions while increasing the overlap region (increasing the number of participant nucleons) of target and projectile nuclei in nucleus-nucleus interactions. The rapidity spectra and transverse momentum distribution of π──mesons were studied systematically in nucleus-nucleus interactions at 4.2AGeV/c. It was analyzed the changes of the c m y . and pT distributions of π──mesons with changing the collision centralities and mass numbers of the incident projectile and target nuclei. It was important to study the changes of the characteristics of produced pions by changing the collision centralities (central, semi-central and peripheral interaction) of the analyzed nucleus-nucleus collisions. The rapidity spectra of π ─ - mesons both in experiment and model in nucleus-nucleus interactions at 4.2GeV/c were analyzed and compared. The rapidity spectra of pions were fitted by Gaussian model function. The transverse momentum spectra at different ranges and different collision centralities were fitted with different theoretical model functions to compare the experimental and simulated model data. For fitting the experimental and simulated model spectra, we used the Hagedorn Thermodynamic Model and Boltzmann Model function. The transverse momentum spectra obtained from experiment, simulated by the model (Quark Gluon String model) were fitted by these models to extract the important parameters, i.e., the spectral temperatures (inverse slope parameters). The spectral temperatures of π ─ -mesons obtained in present work were compared with those of the previous works with different colliding nuclei and also at comparable incident energies.
Gov't Doc #: 21178
URI: http://prr.hec.gov.pk/jspui/handle/123456789/16030
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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