Dissertation > Excellent graduate degree dissertation topics show

The Coalescence Rates for Hadron Production in Relativistic Heavy Ion Collisions

Author: KeWei
Tutor: YangChunBin
School: Central China Normal University
Course: Particle Physics and Nuclear Physics
Keywords: QCD Relativistic heavy ion collisions Quark-gluon plasma Hadronization Recombination model Hadron production rate
CLC: O572.33
Type: Master's thesis
Year: 2011
Downloads: 20
Quote: 0
Read: Download Dissertation

Abstract


QCD (Quantum Chromo-dynamics, referred QCD) predicted: density at high temperatures under extreme conditions, it may produce a new form of matter - the quark-gluon plasma (Quark-Gluon Plasma, referred QGP). The Big Bang theory is that this substance in the universe after the Big Bang had millionth of a second memory in the past. Research on the QGP is that people understand the origin of the universe, the standard model validation is an important way. Can be artificially controlled studies currently the only way QGP relativistic heavy ion collisions. U.S. Brookhaven National Laboratory RHIC and CERN's LHC are committed to the QGP research, and have found the existence of QGP related signals. LHC collision energy is constantly improved in order to more fully understand the nature of QGP. The process of relativistic heavy ion collisions can be simply divided into: the evolution of the initial stage and the final state hadrons stage. There is now only through the establishment of various models to study the generation mechanism of the final state particles. This article describes one of the very successful description of hadron process model-Oregon team quark recombination model (Hwa / Yang model). The model for the first time introduced the concept of parton shower, assuming all before hadronization of quarks and gluons into anti-quark pairs are in the local parton thermal equilibrium, all final state hadrons and by the thermal parton shower parton combination. ALCOR model then introduced the theory and basic formulas. This article describes the introduction of a light quark system short-range potential and the Lorentz Lorentz vector vector confinement potential interaction potential (the potential model considers the quark condensate and the gluon condensate correction), in ALCOR model calculated on the basis of strong intermediary sub-sub-process production rate. First, the use of quantum mechanics rearrangement collision probability amplitude, the interaction potential obtained from the damping factor and the width of the Gaussian wave function for different values ??of the case quark meson combined into a reaction probability amplitude and relative momentum relationship. Then calculate the meson production rate, the results showed that: quasi-meson wave function for the Gaussian wave function or class of hydrogen wave function has little effect on the results. Through analysis, we consider the temperature dependence of the reaction rate is small, this proves recombination model is applicable to cross over the phase change. The reaction rate for the quark interaction potential dependent damping factor μ is relatively large, the greater the damping factor, the slower the reaction rate. Meson wave function in the quasi-Gaussian wave function, the meson production rate also depends on the width of the Gaussian function η.

Related Dissertations

  1. Perturbative QCD method B → φπ,O572.243
  2. Analysis of the Y(4140) and Related Molecular States with QCD Sum Rules,O572.33
  3. Perturbative QCD factorization method under B → PP decay process and the modified two - Higgs model,O572.2
  4. Non-perturbative QCD Based on Dual Superconductor Model,O572.243
  5. Exclusive Decay of P-wave Bottomonium into Double J/Ψ,O572.33
  6. The Strong Decay Properties of Hadrons,O572.33
  7. Light scalar mesons in QCD quark model,O572.33
  8. Electromagnetic coupling angle VPγ research and η-η ' mixing mechanism,O441.4
  9. Penguin operator caused the B → π transition form factor,O572.24
  10. Study of B_c→DK Decay with Perturbative QCD Approach,O572.243
  11. The Research of η and η~1 Pseudoscalar Mesons’ Decay Constnats and Distribution Amplitudes,O572.33
  12. From hadronic matter to quark matter phase transition signals inquiry,O572.243
  13. Angular Dependence of Radiative Energy Loss of Heavy Quarks,O572.33
  14. Pion Distribution Amplitude within the QCD Light Cone Sum Rules,O572.33
  15. Study of Bc→J/ΨK Decays with Perturbative QCD Approach,O572.33
  16. Neutral scalar meson structure and φ meson decays of electromagnetic radiation,O572.33
  17. Strange Mesons in ADS/QCD,O572.33
  18. The Odderon in Diffractive Processes at High Energies,O572.2
  19. B_s→πK Decays and the Correction of the Perturbative QCD,O572.243
  20. Based on QCD production site improvement mode,F273.2

CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle types > Meson
© 2012 www.DissertationTopic.Net  Mobile