Kinetic freeze-out in central Au+Au collisions is a continuous process spanning broad ranges of temperature and baryon chemical potential, with averages nearly flat in transverse momentum and rapidity.
In-Medium Modifications of Hadron Masses and Chemical Freeze-Out in Ultra-Relativistic Heavy-Ion Collisions
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abstract
We confront the hypothesis of chemical freeze-out in ultra-relativistic heavy-ion collisions with the hypothesis of large modifications of hadron masses in nuclear medium. We find that the thermal-model predictions for the ratios of particle multiplicities are sensitive to the values of in-medium hadronic masses. In particular, the $\pi^+/p$ ratio decreases by 35% when the masses of all hadrons (except for pseudo-Goldstone bosons) are scaled down by 30%.
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Temperatures and chemical potentials at kinetic freeze-out in relativistic heavy ion collisions from coarse grained transport simulations
Kinetic freeze-out in central Au+Au collisions is a continuous process spanning broad ranges of temperature and baryon chemical potential, with averages nearly flat in transverse momentum and rapidity.