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Energy dependence of negatively charged pion production in nucleus-nucleus collisions

The thesis is focused on yields and spectra of primary negatively charged pions produced in strong and electromagnetic processes in inelastic $^{40}$Ar+$^{45}$Sc collisions at six beam momenta: 13A, 19A, 30A, 40A, 75A and 150A GeV/𝑐. The data was taken by the NA61/SHINE experiment at the CERN Super...

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Autor principal: Naskret, Michal
Lenguaje:eng
Publicado: 2022
Materias:
Acceso en línea:http://cds.cern.ch/record/2840685
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author Naskret, Michal
author_facet Naskret, Michal
author_sort Naskret, Michal
collection CERN
description The thesis is focused on yields and spectra of primary negatively charged pions produced in strong and electromagnetic processes in inelastic $^{40}$Ar+$^{45}$Sc collisions at six beam momenta: 13A, 19A, 30A, 40A, 75A and 150A GeV/𝑐. The data was taken by the NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) in year 2015. The data was analyzed utilizing the so-called $h$− method. The method is based on the fact that the vast majority of hadrons produced in a heavy ion collision are pions. Using this fact we can apply a correction based on Monte-Carlo generated pion spectra. The correction will be mostly geometric, but excludes also weak decays, secondary interactions and contamination of particles other than pions. The corrected spectra undergo an extrapolation procedure in order to obtain full solid angle 4𝜋 spectra. This consists of an extrapolation using exponential formula in transverse momentum and a sum of two Gaussian functions in rapidity. In order to compare obtained results with other measurements, a calculation of the number of wounded nucleons is necessary. This can’t be done experimentally and the number is obtained using different Monte-Carlo generators. This allows us to normalize the pion production to collision system size. Final experimental results consist of two-dimensional transverse momentum versus rapidity and transverse mass versus rapidity spectra, one-dimensional transverse momentum, transverse mass and rapidity distributions, and finally per event negatively charged pions multiplicities. These are discussed in view of predictions for the Quark-Gluon Plasma and compared to string-hadronic models which do not have the Quark-Gluon Plasma.
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institution Organización Europea para la Investigación Nuclear
language eng
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spelling cern-28406852022-11-17T12:53:03Zhttp://cds.cern.ch/record/2840685engNaskret, MichalEnergy dependence of negatively charged pion production in nucleus-nucleus collisionsNuclear Physics - ExperimentDetectors and Experimental TechniquesThe thesis is focused on yields and spectra of primary negatively charged pions produced in strong and electromagnetic processes in inelastic $^{40}$Ar+$^{45}$Sc collisions at six beam momenta: 13A, 19A, 30A, 40A, 75A and 150A GeV/𝑐. The data was taken by the NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) in year 2015. The data was analyzed utilizing the so-called $h$− method. The method is based on the fact that the vast majority of hadrons produced in a heavy ion collision are pions. Using this fact we can apply a correction based on Monte-Carlo generated pion spectra. The correction will be mostly geometric, but excludes also weak decays, secondary interactions and contamination of particles other than pions. The corrected spectra undergo an extrapolation procedure in order to obtain full solid angle 4𝜋 spectra. This consists of an extrapolation using exponential formula in transverse momentum and a sum of two Gaussian functions in rapidity. In order to compare obtained results with other measurements, a calculation of the number of wounded nucleons is necessary. This can’t be done experimentally and the number is obtained using different Monte-Carlo generators. This allows us to normalize the pion production to collision system size. Final experimental results consist of two-dimensional transverse momentum versus rapidity and transverse mass versus rapidity spectra, one-dimensional transverse momentum, transverse mass and rapidity distributions, and finally per event negatively charged pions multiplicities. These are discussed in view of predictions for the Quark-Gluon Plasma and compared to string-hadronic models which do not have the Quark-Gluon Plasma.CERN-THESIS-2018-500oai:cds.cern.ch:28406852022-11-10T09:59:50Z
spellingShingle Nuclear Physics - Experiment
Detectors and Experimental Techniques
Naskret, Michal
Energy dependence of negatively charged pion production in nucleus-nucleus collisions
title Energy dependence of negatively charged pion production in nucleus-nucleus collisions
title_full Energy dependence of negatively charged pion production in nucleus-nucleus collisions
title_fullStr Energy dependence of negatively charged pion production in nucleus-nucleus collisions
title_full_unstemmed Energy dependence of negatively charged pion production in nucleus-nucleus collisions
title_short Energy dependence of negatively charged pion production in nucleus-nucleus collisions
title_sort energy dependence of negatively charged pion production in nucleus-nucleus collisions
topic Nuclear Physics - Experiment
Detectors and Experimental Techniques
url http://cds.cern.ch/record/2840685
work_keys_str_mv AT naskretmichal energydependenceofnegativelychargedpionproductioninnucleusnucleuscollisions