Strangeness-neutral equation of state for QCD with a critical point

• Published in: European physical journal plus 2021-06, Vol.136 (6), p.621, Article 621
• Main Authors: Karthein, J. M., Mroczek, D., Nava Acuna, A. R., Noronha-Hostler, J., Parotto, P., Price, D. R. P., Ratti, C.
• Format: Article
• Language: English
• Subjects: Applied and Technical Physics; Atomic; Baryons; Complex Systems; Condensed Matter Physics; Critical Point; Equation of State; Equations of state; Heavy ions; Ionic collisions; Ising model; Lattice Quantum Chromodynamics; Magnetic fields; Mathematical and Computational Physics; Molecular; NUCLEAR PHYSICS AND RADIATION PHYSICS; Optical and Plasma Physics; Phase transitions; Physics; Physics and Astronomy; Quantum chromodynamics; Quark Gluon Plasma; Regular Article; Relativistic Heavy Ion Collider; Simulation; Strangeness; Temperature; Theoretical; Three dimensional models
• ISSN: 2190-5444; 2190-5444
• DOI: 10.1140/epjp/s13360-021-01615-5

We present a strangeness-neutral equation of state for QCD that exhibits critical behavior and matches lattice QCD results for the Taylor-expanded thermodynamic variables up to fourth order in μ B / T . It is compatible with the SMASH hadronic transport approach and has a range of temperatures and baryonic chemical potentials relevant for phase II of the Beam Energy Scan at RHIC. We provide an updated version of the software BES-EoS, which produces an equation of state for QCD that includes a critical point in the 3D Ising model universality class. This new version also includes isentropic trajectories and the critical contribution to the correlation length. Since heavy-ion collisions have zero global net-strangeness density and a fixed ratio of electric charge to baryon number, the BES-EoS is more suitable to describe this system. Comparison with the previous version of the EoS is thoroughly discussed.