Transverse hydrodynamics with sudden hadronization -- production of strangeness

TL;DR

This paper presents a model of ultra-relativistic heavy-ion collisions where transverse thermalization occurs early, followed by sudden hadronization, successfully reproducing key experimental observables like spectra and flow at RHIC.

Contribution

It introduces a novel scenario of transverse-only thermalization with sudden hadronization, providing a good match to experimental data from RHIC.

Findings

Reproduces transverse-momentum spectra of pions, kaons, and hyperons.

Accurately models elliptic flow coefficient v2.

Matches HBT radii measurements.

Abstract

We consider a physical scenario for ultra-relativistic heavy-ion collisions where, at the early stage, only transverse degrees of freedom of partons are thermalized, while the longitudinal motion is described by free streaming. When the energy density of the partonic system drops to a certain critical value, the partons hadronize and the newly formed hadronic system freezes out. This sudden change is described with the help of the Landau matching conditions followed by the simulations done with THERMINATOR. The proposed scenario reproduces well the transverse-momentum spectra, the elliptic flow coefficient v2, and the HBT radii of pions and kaons studied at RHIC (Au+Au collisions at the top beam energy). It also reproduces quite well the transverse-momentum spectra of hyperons.