Speaker
Description
We propose to use the entropy-per-baryon number ratio as a clear signal for a first-order phase transition in heavy-ion collisions. Our study uses the chiral fluid dynamics model, coupling the nonequilibrium dynamics of the chiral order parameter to an expanding quark fluid. As the system is driven out of equilibrium, dissipation and noise lead to a significant increase in entropy during the phase transition, in particular for events at low beam energies crossing the phase boundary. For upcoming experiments at FAIR and NICA which are able to create a medium with large baryochemical potential, this could provide a prospect to search for a characteristic behavior in the pion-to-proton ratio as a function of beam energy. Here, our results would qualitatively predict a kink at the energy above which the chirally restored phase is created, such signalling the onset of the QCD phase transition.
| Track | QCD phase diagram and critical point |
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