Isentropic evolution of the matter in heavy-ion collisions and the search for the critical endpoint

Andrea Beraudo; Mario Motta; Rainer Stiele; Wanda Maria Alberico

Isentropic evolution of the matter in heavy-ion collisions and the search for the critical endpoint

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arxiv 2003.04734 v1 pith:WADFLRBO submitted 2020-03-10 hep-ph nucl-th

Isentropic evolution of the matter in heavy-ion collisions and the search for the critical endpoint

Mario Motta , Rainer Stiele , Wanda Maria Alberico , Andrea Beraudo This is my paper

classification hep-ph nucl-th

keywords collisionscriticalevolutionisentropicmatterdiagramdifferentendpoint

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We study the isentropic evolution of the matter produced in relativistic heavy-ion collisions for various values of the entropy-per-baryon ratio of interest for the ongoing and future experimental searches for the critical endpoint (CEP) in the QCD phase diagram: these includes the current Beam-Energy-Scan (BES) program at RHIC and the fixed-target collisions foreseen for the near future at various facilities. We describe the hot-dense matter through two different effective Lagrangians: the PNJL (Polyakov-Nambu-Jona-Lasinio) and the PQM (Polyakov-quark-meson) models. We focus on quantities expected to have a direct experimental relevance: the speed of sound, responsible for the collective acceleration of the fireball, and the generalized susceptibilities, connected to the cumulants of the distributions of conserved charges. In principle, they should affect the momentum spectra and the event-by-event fluctuations of the yields of identified particles. Taking realistic values for the initial temperature and the entropy-per-baryon ratio we study the temporal evolution of the above quantities looking for differences along isentropic trajectories covering different regions of the QCD phase diagram, passing far or close to the CEP or even intersecting the first-order critical line.

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Isentropic thermodynamics across the hadron-quark mixed phase in a two-phase model with a PNJL quark description
hep-ph 2026-03 conditional novelty 5.0

In a two-phase RMF+PNJL model, isentropic trajectories through the hadron-quark mixed phase heat at low entropy per baryon and cool near the critical end point, with entropy-dependent speed-of-sound structures.