Transverse-Mass Effective Temperature in Heavy-Ion Collisions from AGS to SPS

TL;DR

This paper analyzes transverse-mass spectra in heavy-ion collisions across a wide energy range using a 3-fluid dynamics model, explaining experimental inverse-slope behaviors and suggesting a common hydrodynamic freeze-out for different particles.

Contribution

It introduces a dynamical freeze-out model within 3-fluid dynamics that naturally explains the energy dependence of inverse-slope parameters in heavy-ion collisions.

Findings

The model reproduces inverse-slope parameters for protons, pions, and kaons across energies.

A common hydrodynamic flow at freeze-out is consistent for all particle types.

The approach explains the incident energy behavior observed in experiments.

Abstract

Transverse-mass spectra in Au+Au and Pb+Pb collisions in incident energy range from 2A to 160A GeV are analyzed within the model of 3-fluid dynamics. It is shown that dynamical description of freeze-out, accepted in this model, naturally explains the incident energy behavior of inverse-slope parameters of these spectra observed in experiment. Simultaneous reproduction of the inverse-slopes of all considered particles (protons, pions and kaons) suggests that these particles belong to the same hydrodynamic flow at the instant of their freeze-out.