Abstract
We study the identified particle ratios produced at mid-rapidity (y<0.5) in heavy-ion collisions, along with their correlations with the collision energy. We employ our earlier proposed unified statistical thermal freeze-out model (USTFM), which incorporates the effects of both longitudinal and transverse hydrodynamic flow in the hot hadronic system. A fair agreement seen between the experimental data and our model results confirms that the particle production in these collisions is of statistical nature. The variation of the chemical freeze-out temperature and the baryon chemical potential with respect to collision energies is studied. The chemical freeze-out temperature is found to be almost constant beyond the RHIC energy and is found to be close to the QCD predicted phase-transition temperature suggesting that the chemical freeze-out occurs soon after the hadronization takes place. The vanishing value of chemical potential at LHC indicates very high degree of nuclear transparency in the collision.
Highlights
Relative hadron yields and their correlations are observable which can provide information on the nature, composition, and size of the medium from which they originate in high energy heavy-ion collisions where a strongly interacting nuclear matter at high energy density and temperatures is formed
After the hadronization of the hot fireball, the hadrons keep interacting with each other and the particle number changing reaction processes continue to take place till the temperature drops to a certain value where a given reaction process almost comes to a stop
We attempt to reproduce the particle ratios and to study their correlations and the energy dependence in the hadron gas (HG) scenario by using our phenomenological boost invariant unified statistical thermal freeze-out model (USTFM) [1, 13,14,15,16,17] which assumes that at freeze-out all the hadrons in the hadron gas resulting from a high energy nuclear collision follow an equilibrium distribution
Summary
Relative hadron yields and their correlations are observable which can provide information on the nature, composition, and size of the medium from which they originate in high energy heavy-ion collisions where a strongly interacting nuclear matter at high energy density and temperatures is formed. After the hadronization of the hot fireball, the hadrons keep interacting with each other and the particle number changing (inelastic) reaction processes continue to take place till the temperature drops to a certain value where a given reaction process almost comes to a stop. We attempt to reproduce the particle ratios and to study their correlations and the energy dependence in the hadron gas (HG) scenario by using our phenomenological boost invariant unified statistical thermal freeze-out model (USTFM) [1, 13,14,15,16,17] which assumes that at freeze-out all the hadrons in the hadron gas resulting from a high energy nuclear collision follow an equilibrium distribution. The local particle phase space densities have the form of the FermiDirac or Bose-Einstein statistical distributions
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