2020/03/10 by Mário Motta, Motta, Mario, Rainer Stiele +5 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2003.04734
openalex publication_date 2020/03/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the isentropic evolution of the matter produced in relativistic\nheavy-ion collisions for various values of the entropy-per-baryon ratio of\ninterest for the ongoing and future experimental searches for the critical\nendpoint (CEP) in the QCD phase diagram: these includes the current\nBeam-Energy-Scan (BES) program at RHIC and the fixed-target collisions foreseen\nfor the near future at various facilities. We describe the hot-dense matter\nthrough two different effective Lagrangians: the PNJL\n(Polyakov-Nambu-Jona-Lasinio) and the PQM (Polyakov-quark-meson) models. We\nfocus on quantities expected to have a direct experimental relevance: the speed\nof sound, responsible for the collective acceleration of the fireball, and the\ngeneralized susceptibilities, connected to the cumulants of the distributions\nof conserved charges. In principle, they should affect the momentum spectra and\nthe event-by-event fluctuations of the yields of identified particles. Taking\nrealistic values for the initial temperature and the entropy-per-baryon ratio\nwe study the temporal evolution of the above quantities looking for differences\nalong isentropic trajectories covering different regions of the QCD phase\ndiagram, passing far or close to the CEP or even intersecting the first-order\ncritical line.\n