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.
Strangeness Production in low energy Heavy Ion Collisions via Hagedorn Resonances
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abstract
A novel, unorthodox picture of the dynamics of heavy ion collisions is developed using the concept of Hagedorn states. A prescription of the bootstrap of Hagedorn states respecting the conserved quantum numbers baryon number B, strangeness S, isospin I is implememted into the GiBUU transport model. Using a strangeness saturation suppression factor suitable for nucleon-nucleon-collisions, recent experimental data for the strangeness production by the HADES collaboration in Au+Au and Ar+KCl is reasonable well described. The experimental observed exponential slopes of the energy distributions are nicely reproduced. Thus, a dynamical model using Hagedorn resonance states, supplemented by a strangeness saturation suppression factor, is able to explain essential features (multiplicities, exponential slope) of experimental data for strangeness production in nucleus-nucleus collisions close to threshold.
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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.