Studies of the hydrodynamic evolution of the dense baryonic matter produced in relativistic heavy ion collisions

TL;DR

This paper models the space-time evolution of dense baryonic matter in relativistic heavy ion collisions using hydrodynamics, analyzing flow effects and dilepton/photon signals to understand cooling and particle production.

Contribution

It introduces a hydrodynamic framework for dense baryonic matter evolution and presents the first preliminary calculations of dilepton and photon production signals.

Findings

Rapid cooling suppresses low-mass dileptons and low-pT photons.

Transverse flow influences the evolution and particle yields.

Hydrodynamic modeling aligns with experimental collision energies.

Abstract

We use the relativistic perfect-fluid hydrodynamics to describe the space-time evolution of dense baryonic matter produced in the central nucleus-nucleus collisions at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD, and RHIC-BES. The transverse flow of the fireball with cylindrical symmetry and boost invariant along the longitudinal direction is also analyzed. Based on the relativistic kinetic theory, we also present the first preliminary calculation on the production of low-mass dileptons and low-pT photons can be considered as the signals of the dense baryonic matter produced in the central Au-Au and U-U collisions. We find that the rapid cooling of the expanding dense baryonic matter with transverse flow effect can lead to the suppression of the low-mass dileptons and low-pT photons production at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD, and RHIC-BES energies.