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| Natura: | Preprint |
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2024
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| Accesso online: | https://arxiv.org/abs/2408.06473 |
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| _version_ | 1866912362954489856 |
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| author | Lysenko, Artemiy Gorenstein, Mark I. Poberezhniuk, Roman Vovchenko, Volodymyr |
| author_facet | Lysenko, Artemiy Gorenstein, Mark I. Poberezhniuk, Roman Vovchenko, Volodymyr |
| contents | The chemical freeze-out curve in heavy-ion collisions is investigated in the context of a quantum chromodynamics (QCD) critical point (CP) search at finite baryon densities. Taking the hadron resonance gas picture at face value, chemical freeze-out points at a given baryochemical potential provide a lower bound on the possible temperature of the QCD CP. We first verify that the freeze-out data in heavy-ion collisions are well described by a constant energy per particle curve, $E/N = \rm const$, under strangeness neutrality conditions ($μ_S \neq 0$, $μ_Q \neq 0$). We then evaluate the hypothetical lower bound on the freeze-out curve based on this criterion in the absence of strangeness neutrality ($μ_S = 0$, $μ_Q = 0$) and confront it with recent predictions on the CP location. We find that recent estimates based on Yang-Lee edge singularities from lattice QCD data on coarse lattices ($N_τ = 6$) place the CP significantly below the freeze-out curve, hinting at the importance of performing continuum extrapolation within this method. Predictions based on functional methods and holography place the CP slightly above the freeze-out curve, indicating that the QCD CP may be located very close to the chemical freeze-out in $A$+$A$ collisions at $\sqrt{s_{NN}} = 3.5$-$6$ GeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_06473 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chemical freeze-out curve in heavy-ion collisions and the QCD critical point Lysenko, Artemiy Gorenstein, Mark I. Poberezhniuk, Roman Vovchenko, Volodymyr Nuclear Theory The chemical freeze-out curve in heavy-ion collisions is investigated in the context of a quantum chromodynamics (QCD) critical point (CP) search at finite baryon densities. Taking the hadron resonance gas picture at face value, chemical freeze-out points at a given baryochemical potential provide a lower bound on the possible temperature of the QCD CP. We first verify that the freeze-out data in heavy-ion collisions are well described by a constant energy per particle curve, $E/N = \rm const$, under strangeness neutrality conditions ($μ_S \neq 0$, $μ_Q \neq 0$). We then evaluate the hypothetical lower bound on the freeze-out curve based on this criterion in the absence of strangeness neutrality ($μ_S = 0$, $μ_Q = 0$) and confront it with recent predictions on the CP location. We find that recent estimates based on Yang-Lee edge singularities from lattice QCD data on coarse lattices ($N_τ = 6$) place the CP significantly below the freeze-out curve, hinting at the importance of performing continuum extrapolation within this method. Predictions based on functional methods and holography place the CP slightly above the freeze-out curve, indicating that the QCD CP may be located very close to the chemical freeze-out in $A$+$A$ collisions at $\sqrt{s_{NN}} = 3.5$-$6$ GeV. |
| title | Chemical freeze-out curve in heavy-ion collisions and the QCD critical point |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2408.06473 |