New Signals of Quark-Gluon-Hadron Mixed Phase Formation

Abstract

Here we present several remarkable irregularities at chemical freeze-out which are found using an advanced version of the hadron resonance gas model. The most prominent of them are the sharp peak of the trace anomaly existing at chemical freeze-out at the center of mass energy 4.9 GeV and two sets of highly correlated quasi-plateaus in the collision energy dependence of the entropy per baryon, total pion number per baryon, and thermal pion number per baryon which we found at the center of mass energies 3.8-4.9 GeV and 7.6-10 GeV. The low energy set of quasi-plateaus was predicted a long time ago. On the basis of the generalized shock-adiabat model we demonstrate that the low energy correlated quasi-plateaus give evidence for the anomalous thermodynamic properties inside the quark-gluon-hadron mixed phase. It is also shown that the trace anomaly sharp peak at chemical freeze-out corresponds to the trace anomaly peak at the boundary between the mixed phase and quark gluon plasma. We argue that the high energy correlated quasi-plateaus may correspond to a second phase transition and discuss its possible origin and location. Besides we suggest two new observables which may serve as clear signals of these phase transformations.

14 pages, 4 figures, new signals of QGP formation are suggested

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Cited by in corpus (12)

• Hadron Resonance Gas Model with Induced Surface Tension
• Threshold Collision Energy of the QCD Phase Diagram Tricritical Endpoint
• Hard-core Radius of Nucleons within the Induced Surface Tension Approach
• Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions
• Possible signals of two QCD phase transitions at NICA-FAIR energies
• Deconfinement and freezeout boundaries in equilibrium thermal models
• A possible evidence of observation of two mixed phases in nuclear collisions
• Classical excluded volumes of loosely bound light (anti)nuclei and their chemical freeze-out in heavy ion collisions
• Probing the tricritical endpoint of QCD phase diagram at NICA-FAIR energies
• Chemical freeze-out of light nuclei in high energy nuclear collisions and resolution of the hyper-triton chemical freeze-out puzzle
• Pseudoscalar mesons from a PNJL model at zero temperature
• Evidence of the mixed phase formation in nucleus-nucleus collisions