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arXiv · 1603.04971

Indication of Differential Kinetic Freeze-out at RHIC and LHC Energies

D. Thakur·S. Tripathy·P. Garg·R. Sahoo and·J. Cleymans
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Abstract

The transverse momentum spectra at RHIC and LHC for A+A and p+p collisions are studied with Tsallis distributions in different approaches i.e. with and without radial flow. The information on the freeze-out surface in terms of freeze-out volume, temperature, chemical potential and radial flow velocities for different particle species are obtained. These parameters are found to show a systematic behavior with mass dependence. It is observed that the heavier particles freeze-out early as compared to lighter particles and freeze-out surfaces are different for different particles, which is a direct signature of mass dependent differential freeze-out. Further, we observe that the radial flow velocity decreases with increasing mass. This confirms the mass ordering behavior in collectivity observed in heavy-ion collisions. It is also observed that the systems created in peripheral heavy-ion collisions and in proton-proton collisions are of similar thermodynamic nature.

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D. Thakur, S. Tripathy, P. Garg, R. Sahoo and, J. Cleymans. 2016-03-16. Indication of Differential Kinetic Freeze-out at RHIC and LHC Energies. https://arxiv.org/abs/1603.04971

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