Particle multiplicities and particle ratios in excluded volume model

Abstract

One of the most surprising results is to find that a consistent description of all the experimental results on particle multiplicities and particle ratios obtained from the lowest AGS to the highest RHIC energies is possible within the framework of a thermal statistical model. We propose here a thermodynamically consistent excluded-volume model involving an interacting multi-component hadron gas. We find that the energy dependence of the total multiplicities of strange and non-strange hadrons obtained in this model agrees closely with the experimental results. It indicates that the freeze out volume of the fireball is uniformly the same for all the particles. We have also compared the variation of the particle ratios such as $<K^{+}>/<{\pi }^{+}>,<K^{-}>/<{\pi }^{-}>,K^{-}/K^{+},\bar{p}/p,\bar{\Lambda }/\Lambda ,\bar{\Xi }/\Xi ,\bar{\Omega }/\Omega ,<\Lambda >/<\pi >,<{\Xi }^{-}>/<\pi >,<\Omega +\bar{\Omega }>/<\pi >$ and $<\Phi >/<\pi >$ with respect to the center-of-mass energy as predicted by our model with the recent experimental data.

15 pages, 12 figures

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• Description of Hot and Dense Hadron Gas Properties in a New Excluded-Volume model
• QCD Critical Point in a Quasiparticle Model
• Hot and dense hadronic matter in an effective mean field approach
• A Hybrid Model for QCD Deconfining Phase Boundary
• Thermodynamical Consistency of Excluded Volume Hadron Gas Models
• QCD Phase Boundary and Critical Point in a Bag Model Calculation
• Collision Energy Dependence of Particle Ratios and Freeze-out Parameters in Ultra Relativistic Nucleus Nucleus Collisions
• The effect of flow on Hadronic Spectra in an Excluded-Volume Model
• Strongly Interacting Matter at Finite Chemical Potential : Hybrid Model Approach
• Transverse Energy per Charged Particle in Heavy-Ion Collisions: Role of Collective Flow
• Limiting Fragmentation in a Thermal Model with Flow