Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

# Study of Dependence of Kinetic Freezeout Temperature on Production Cross-Section of the Particles in Various Centrality Intervals in Au-Au and Pb-Pb Collisions at High Energies

Version 1 : Received: 8 April 2021 / Approved: 8 April 2021 / Online: 8 April 2021 (15:38:35 CEST)

A peer-reviewed article of this Preprint also exists.

Waqas, M.; Peng, G.-X. Study of Dependence of Kinetic Freezeout Temperature on the Production Cross-Section of Particles in Various Centrality Intervals in Au–Au and Pb–Pb Collisions at High Energies. Entropy 2021, 23, 488. Waqas, M.; Peng, G.-X. Study of Dependence of Kinetic Freezeout Temperature on the Production Cross-Section of Particles in Various Centrality Intervals in Au–Au and Pb–Pb Collisions at High Energies. Entropy 2021, 23, 488.

Journal reference: Entropy 2021, 23, 488
DOI: 10.3390/e23040488

## Abstract

Transverse momentum spectra of +, p, Λ, Ξ or ¯Ξ+, Ω or ¯Ω+ and deuteron (d) in different centrality intervals in Gold-Gold (Au-Au) and Lead-Lead (Pb-Pb) collisions at 62.4 GeV and 2.76 TeV respectively, are analyzed by the blast wave model with Boltzmann Gibbs statistics. We extracted Kinetic freeze out temperature,transverse flow velocity and kinetic freezeout volume from the transverse momentum spectra of the particles. It is observed that the non-strange and strange (multi-strange) particles freezeout separately due to different reaction cross-sections. While the freezeout volume and transverse flow velocity are mass dependent which decrease with the rest mass of the particles. The present work reveals the scenario of double kinetic freezeout in collisions at STAR and ALICE Collaborations. Furthermore, the kinetic freezeout temperature and freezeout volume are larger in central collisions than the peripheral collisions and they decrease from central to periphery. However the transverse flow velocity remains almost unchanged from central to peripheral collisions.

## Keywords

non-strange; strange; multi-strange; kinetic freeze-out temperature; transverse flow velocity; freezeout volume; cross-section; centrality bins; transverse momentum spectra

## Subject

PHYSICAL SCIENCES, Acoustics

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