Study of freeze-out dynamics in STAR at RHIC Beam Energy Scan Program

Abstract

The STAR detector at RHIC, due to its large uniform acceptance and excellent particle identification capabilities, has measured a variety of hadron species (${\pi }^{\pm }$, $K^{\pm }$, $p$, $\bar{p}$, $K_S^0$, $\Lambda$, $\bar{\Lambda }$, ${\Xi }^{-}$, ${\bar{\Xi }}^{+}$) produced in Au+Au collisions at $\sqrt{s_{NN}}=7.7$, 11.5, 27 and 39 GeV. These data are part of the Beam Energy Scan (BES) program at RHIC and provide an opportunity to measure the yields and transverse momentum spectra ($p_T$) of the particles produced in the collisions. The corresponding measurements allow to study the freeze-out properties and dynamics of heavy ion collisions. A statistical thermal model analysis of particle production in BES energies in both grand canonical and strangeness canonical ensembles, is used to extract the chemical freeze-out parameters. The $p_T$ spectra, particle ratios, and the energy and centrality dependence of freeze-out parameters determined from the thermal fit of particle ratios are discussed.

4 pages, 7 figures, Presented at the Strangeness in Quark Matter Conference (SQM 2013), Birmingham, UK, July 22-27, 2013

References in corpus (5)

• The order of the quantum chromodynamics transition predicted by the standard model of particle physics
• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Scale for the Phase Diagram of Quantum Chromodynamics
• Canonical partition function and finite density phase transition in lattice QCD
• Strange and Multi-strange Particle Production in Au+Au Collisions at $\sqrt{s_{NN}}$ = 62.4 GeV

Cited by in corpus (7)

• Heavy Ion Collisions: Achievements and Challenges
• Freeze-out conditions from net-proton and net-charge fluctuations at RHIC
• Systematics of chemical freeze-out parameters in heavy-ion collision experiments
• Novel scheme for parametrizing the chemical freeze-out surface in Heavy Ion Collision Experiments
• Formation of light nuclei at chemical freezeout: Description within a statistical thermal model
• Chemical Freeze-out Parameters via a Non-perturbative QCD Approach
• Chemical freeze-out systematics of thermal model analysis using hadron yield ratios