Early strangeness freeze-out from RHIC BES to LHC

Jia Chen,Li Yi,Zhangbu Xu,Zebo Tang,Jian Deng,G David,S Mukherjee,P Garg,A Kalweit,Z Xu,I.-K Yoo,T Ullrich

doi:10.1051/epjconf/202225911001

Abstract

In this talk, we investigate the collision energy and particle species dependence of kinetic freeze-out properties in relativistic heavy ion collisions from √SNN = 7.7 - 200 GeV at Relativistic Heavy Ion Collider (RHIC) and 2.76 TeV at the Large Hadron Collider (LHC) with Tsallis Blast-Wave (TBW) model. Strangeness and non-strange particles show a similar radial flow, while the strange hadrons have higher temperature and smaller non-equilibrium degree. Strangeness approaches equilibrium more quickly than non-strange particles from peripheral to central collisions. The kinetic freeze-out temperature of non-strange particles in central collisions decreases from RHIC to LHC energies, while strangeness does not show this behavior. Finally we discuss the system bulk viscosity dependence on collision energy.

Highlights

The final transverse momentum spectra of hadrons carry information about kinetic freeze-out properties of the hot and dense system created in relativistic heavy ion collisions
Strange hadrons serve as an excellent probe to locate the QCD phase boundary
The collision energy dependence of kinetic freeze-out properties for strange hadrons in heavy ion collisions is valuable for exploring QCD phase diagram

Summary

Introduction

The final transverse momentum (pT ) spectra of hadrons carry information about kinetic freeze-out properties of the hot and dense system created in relativistic heavy ion collisions. The study of energy dependence of freeze-out properties is an important tool to explore QCD phase diagram. The RHIC Beam Energy Scan (BES) program and the heavy ion program at the LHC has provided a wide energy coverage for the freeze-out properties study. The collision energy dependence of kinetic freeze-out properties for strange hadrons in heavy ion collisions is valuable for exploring QCD phase diagram. Tsallis Blast-Wave (TBW) model was later introduced to describe the particle production for an extended pT range in high energy collisions [5–10]. In this proceeding, we will employ blast-wave fits on particle productions from. RHIC BES to the LHC and focus on the strangeness and non-strangeness kinetic freeze-out comparison

Analysis method

All particles

Conclusion