Production and ratio of $\pi$, K, p and $\Lambda$ in Pb + Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

Abstract

The particle production and their ratios for $\pi$, $K$, $p$, and $\Lambda$ are studied in Pb + Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV based on a blast-wave model with thermal equilibrium mechanism. The transverse momentum spectra of the above mentioned particles at the kinetic freeze-out stage are discussed. The modification of the inverse slope of pion transverse momentum spectrum due to resonance decay has also been investigated. In addition, we found that the anti-particles to particles ratio as well as kaons to pions ratio agree with the data by the LHC-ALICE Collaboration reasonably well, while the $p/\pi$ ratio is overestimated by a factor of 1.5, similar to those from other thermal model calculations. It is found that the ratios of $p/\pi$ and $K/\pi$ are dominated by the radial flow but slightly affected by the baryon chemical potential. Our study thus constrains the parameters at the chemical and kinetic freeze-out stages within the framework of thermal model in Pb + Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV, and will help better understand the properties of the dense and hot matter created in high-energy heavy-ion collisions at freeze-out stage.

9 pages, 5 figures and 1 table

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• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Hydrodynamic Models for Heavy Ion Collisions
• Results from the Relativistic Heavy Ion Collider
• Inclusive charged hadron elliptic flow in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7 - 39 GeV
• Therminator: Thermal heavy-Ion generator
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• Production of Kaon and $\Lambda$ in nucleus-nucleus collisions at ultra-relativistic energy from a blast wave model
• Particle Yields and Ratios within Equilibrium and Non-Equilibrium Statistics
• Light Hadron Production in Proton-Proton Collisions at Different LHC Energies: Measured Data versus a Model
• Pion, Kaon and Antiproton Production in $Pb+Pb$ Collisions at LHC Energy $\sqrt{s_{NN}}$ = 2.76 TeV : A Model-based Analysis