Quantum chromodynamics and the statistical hydrodynamical model of hadron production
We analyze the Fermi-Landau statistical hydrodynamical model of hadron-hadron multiplicities in the framework of QCD, using the Pokorski--Van Hove model wherein the collision of preexisting glue dominates the multiplicity. It is noted that previous dismissal of the possibility of thermalization in the basis of nuclear ''transparency'' is circumvented in this picture because the valence quarks pass through, whereas the gluon clouds interact strongly. Assuming that the gluons equilibrate to a thermalized plasmoid within the Fermi-Landau (FL) Lorentz-contracted initial volume, we derive a simple formula for the multiplicity with the form N/sub ch/roughly-equal2.5 f/sup 1/4/ W/sup 1/2//sub had/ (three flavors excited), where 1-f is the fraction of energy carried away by the leading particles and W/sub had/ = fW is the energy left behind. If f were fixed at a constant value of (1/2), the formula would agree extremely well with data up to and including p-barp collider energies. (The widely held belief that collider multiplicities rule out the Fermi power law was based on the use of W rather than W/sub had/.) However, using the data of Basile et al., in which multiplicities are broken down as a function of W/sub had/ for different W values, we find that the f/sup 1/4/ dependence is ruled out. We conclude that thermalization of the colliding gluon clouds in the FL volume is also ruled out, although thermalization in the gluon fragmentation and central regions remains a possibility.
- Research Organization:
- Theoretical Division, Los Alamos National Laboratory, P.O. Box 1662, Los Alamos, New Mexico 87545
- OSTI ID:
- 5827436
- Journal Information:
- Phys. Rev. D; (United States), Vol. 28:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HADRONS
PARTICLE PRODUCTION
QUANTUM CHROMODYNAMICS
HYDRODYNAMIC MODEL
GLUONS
MULTIPLICITY
PERTURBATION THEORY
PROTON-PROTON INTERACTIONS
QUARKS
SUM RULES
BARYON-BARYON INTERACTIONS
ELEMENTARY PARTICLES
EQUATIONS
FIELD THEORIES
HADRON-HADRON INTERACTIONS
INTERACTIONS
MATHEMATICAL MODELS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
QUANTUM FIELD THEORY
STATISTICAL MODELS
THERMODYNAMIC MODEL
645400* - High Energy Physics- Field Theory
645204 - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties