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Kinetic freeze-out in central heavy-ion collisions between 7.7 and 2760 GeV per nucleon pair
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Kinetic freeze-out in central heavy-ion collisions between 7.7 and 2760 GeV per nucleon pair
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We fit the single-particle $p_t$ spectra of identified pions, kaons, and (anti)protons from central collisions of gold or lead nuclei at energies between 7.7 and 2760~GeV per nucleon pair. Blast wave model with included resonance production and with an assumption of partial chemical equilibrium is used and the fits are performed with the help of a Gaussian emulator process. A kinetic freeze-out temperature is found about 100~MeV for the lowest collision energies and 80~MeV at the LHC. The average transverse expansion velocity grows with increasing $\sqrt{s_{NN}}$ from 0.45 to 0.65. Due to partial chemical equilibrium, the influence of resonance decays on the shape of the $p_t$ spectra for $\sqrt{s_{NN}}$ above 27~GeV is small.
Forward citations
Cited by 1 Pith paper
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An expanding spherical fireball model for light hadron production at RHIC ($\sqrt{s_{\rm NN}}=7.7$--$39$ GeV)
An expanding spherical fireball model with Cooper–Frye freeze-out describes STAR pT spectra of π±, K±, p, p̄ at √sNN=7.7–39 GeV and predicts Gaussian rapidity distributions.
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