Study of meson-baryon correlations in relativistic nuclear collisions registered by the STAR detector

Marcin Zawisza

Abstract

Correlations between non-identical particles at small relative velocity probe asymmetries in the average space-time emission points at freeze-out. The origin of such asymmetries may arise from long-lived resonances, bulk collective effects, or differences in the freeze-out scenario for the different particle species. This thesis presents study of meson-baryon (pion-proton) femtoscopy in Au+Au collisions at √sNN = 200GeV. Data used in this work was registered by the STAR (Solenoidal Tracker at RHIC) experiment in Brookhaven National Laboratory in 2004. Scientific program of the STAR experiment was dedicated to search for Quark Gluon Plasma and investigation of its properties. Analysis presented here is an element of this exciting and pioneering scientific adventure. This work was done at the most advanced experimental facility, dedicated to heavy ion collisions, in the World . Obtained experimental results proved that average emission points of pions and protons are not the same. Source of protons is smaller than the source of pions and is shifted to the edge of the system created in heavy ion collision. This dissertation is organized as follows. Short introduction to the heavy ion physics, basic concepts of the signatures of the quark gluon plasma can be found in the chapter 1. Formalism related to the correlation functions or final state interactions FSI is presented in the chapter 2. Chapter 3 shows overview of the HBT analyzes done by the STAR collaboration for the Au+Au collisions. It contains also overview of the attempts to the pion-proton femtoscopy made so far by a few other collaborations. Description of the experimental setup RHIC complex and STAR experiment can be found in the chapter 4. Experimental analysis, technique and obtained results step by step are described in the chapter 5. Discussion and interpretation of the results is done via comparison to the similar studies performed with Therminator and UrQMD models and is presented in chapter 6. At the end the whole work is summarized in the chapter 7.
Diploma typeDoctor of Philosophy
Author Marcin Zawisza (FP)
Marcin Zawisza,,
- Faculty of Physics
Title in EnglishStudy of meson-baryon correlations in relativistic nuclear collisions registered by the STAR detector
Languageen angielski
Certifying UnitFaculty of Physics (FP)
Disciplinephysics / (physical sciences domain) / (physical sciences)
Defense Date24-11-2010
Supervisor Jan Pluta (FP / NPD)
Jan Pluta,,
- Nuclear Physics Division

Internal reviewers Bronislaw Słowiński (FP / NPD)
Bronislaw Słowiński,,
- Nuclear Physics Division
External reviewers Wojciech Broniowski - [Jan Kochanowski University, Kielce]
Wojciech Broniowski,,
-
- Uniwersytet Jana Kochanowskiego w Kielcach
Pages107
Keywords in Englishxxx
Abstract in EnglishCorrelations between non-identical particles at small relative velocity probe asymmetries in the average space-time emission points at freeze-out. The origin of such asymmetries may arise from long-lived resonances, bulk collective effects, or differences in the freeze-out scenario for the different particle species. This thesis presents study of meson-baryon (pion-proton) femtoscopy in Au+Au collisions at √sNN = 200GeV. Data used in this work was registered by the STAR (Solenoidal Tracker at RHIC) experiment in Brookhaven National Laboratory in 2004. Scientific program of the STAR experiment was dedicated to search for Quark Gluon Plasma and investigation of its properties. Analysis presented here is an element of this exciting and pioneering scientific adventure. This work was done at the most advanced experimental facility, dedicated to heavy ion collisions, in the World . Obtained experimental results proved that average emission points of pions and protons are not the same. Source of protons is smaller than the source of pions and is shifted to the edge of the system created in heavy ion collision. This dissertation is organized as follows. Short introduction to the heavy ion physics, basic concepts of the signatures of the quark gluon plasma can be found in the chapter 1. Formalism related to the correlation functions or final state interactions FSI is presented in the chapter 2. Chapter 3 shows overview of the HBT analyzes done by the STAR collaboration for the Au+Au collisions. It contains also overview of the attempts to the pion-proton femtoscopy made so far by a few other collaborations. Description of the experimental setup RHIC complex and STAR experiment can be found in the chapter 4. Experimental analysis, technique and obtained results step by step are described in the chapter 5. Discussion and interpretation of the results is done via comparison to the similar studies performed with Therminator and UrQMD models and is presented in chapter 6. At the end the whole work is summarized in the chapter 7.
Thesis file
Zawisza.pdf 4 MB

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