Probing the QCD phase transition with hadron multiplicity ratios

T. Bumnedpan, J. Steinheimer, M. Bleicher, A. Limphirat,C. Herold

28TH INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, INPC 2022(2023)

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摘要
We investigate the impact of a first-order chiral phase transition and critical point on hadron multiplicity ratios. We model the dynamical expansion of the hot and dense matter created in a heavy ion collision with a Bjorken hydrodynamics expansion coupled to the explicit evolution of the chiral order parameter at center-of-mass energies from 2 to 7 GeV. Hereby, the chiral dynamics is implemented using a Langevin equation including dissipation and noise. We find a strong enhancement of the entropy-per-baryon S/A at lowest energies which is created at the non-equilibrium first-order phase transition. By mapping the initial and final S/A to a hadron resonance gas, we can quantify the shift of hadron multiplicity ratios.
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关键词
qcd phase transition,multiplicity
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