Enhanced pion-to-proton ratio at the onset of the QCD phase transition

  • The pion-to-proton ratio is identified as a potential signal for a non-equilibrium first-order chiral phase transition in heavy-ion collisions, as the pion multiplicity is directly related to entropy production. To showcase this effect, a non-equilibrium Bjorken expansion starting from realistic initial conditions along a Taub adiabat is used to simulate the entropy production. Different dynamical criteria to determine the final entropy-per-baryon number are investigated and matched to a hadron resonance gas model along the chemical freeze out curve to obtain the final pion and proton numbers. We detect a strong enhancement of their multiplicity ratio at the energies where the system experiences a strong phase transition as compared to a smooth crossover which shows almost no enhancement.

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Author: Thiranat BumnedpanORCiD, Jan SteinheimerORCiDGND, Marcus BleicherORCiDGND, Ayut LimphiratORCiD, Christoph HeroldORCiDGND
Parent Title (English):Physics Letters B
Place of publication:Amsterdam
Document Type:Article
Date of Publication (online):2022/11/03
Date of first Publication:2022/10/27
Publishing Institution:Universit├Ątsbibliothek Johann Christian Senckenberg
Release Date:2023/10/09
Tag:Elsevier; LaTeX; Template; elsarticle.cls
Page Number:5
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International