Abstract
The transverse momentum spectra of several types of hadrons,p,p̅,K+,K-,Ks0,Λ,Ω,Ω̅,Ξ-, andΞ̅produced in most central Pb-Pb collisions at LHC energysNN=2.76 TeV have been studied at midrapidity (|y|<0.5) using an earlier proposed unified statistical thermal freeze-out model. The calculated results are found to be in good agreement with the experimental data measured by the ALICE experiment at LHC. The model calculation fits provide the thermal freeze-out conditions in terms of the temperature and collective flow effect parameters for different particle species. Interestingly the model parameter fits to the experimental data reveal stronger collective flow in the system and lesser freeze-out temperatures of the different particle species as compared to Au-Au collisions at RHIC. The strong increase of the collective flow appears to be a consequence of the increasing particle density at LHC. The model used incorporates a longitudinal as well as transverse hydrodynamic flow. The chemical potential has been assumed to be nearly equal to zero for the bulk of the matter owing to high degree of nuclear transparency effect at such collision energies. The contributions from heavier decay resonances are also taken into account.
Highlights
The study of identified particle spectra in heavy-ion collisions at ultrarelativistic energies is an important tool to investigate the properties of the strongly interacting system created in such collisions
The study helps us to learn about the final state distribution of baryon numbers among various particle species at the thermochemical freeze-out after the collision which is initially carried by the nucleons only [1]
Within the framework of the statistical model, it is assumed that a hot and dense fireball is formed over an extended region for a brief period of time (∼ a few fm/c) after the initial collision and it undergoes collective expansion leading to a decrease in its temperature and to the hadronization
Summary
The study of identified particle spectra in heavy-ion collisions at ultrarelativistic energies is an important tool to investigate the properties of the strongly interacting system created in such collisions. An accurate measurement of the transverse momentum distributions of identified hadrons along with the rapidity spectra is essential for the understanding of the dynamics and the properties of the created matter up to the final thermal or hydrodynamical freeze-out in case of collective flow [7].
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