Speaker
Lokesh Kumar
(National Institution of Science Education and Research)
Description
The main aim of the RHIC Beam Energy Scan (BES) program is to
explore the QCD phase diagram which includes search for a possible
QCD critical point and the phase boundary between QGP and hadronic phase.
We report the collision energy and centrality dependence of kinetic
freeze-out properties from the measured mid-rapidity light hadrons
(pions, kaons, protons and their anti-particles) for Au+Au collisions
at the center-of-mass energy root(s_nn) = 7.7, 11.5, 19.6, 27, and
39 GeV. The STAR detector, with a large uniform acceptance and
excellent particle identification is used in the data taking.
The kinetic freeze-out temperature (T_fo) and average collective
velocity (beta) parameters are extracted from blast-wave fits
to the identified hadron spectra and systematically compared with
the results from other collision energies including those at AGS,
SPS and LHC. It is found that all results fall into a correlation
band in the 2-dimension (T_fo, beta) distribution: the largest
value of collective velocity and lowest temperature is reached in
the most central collisions at the highest collision energy.
We study the energy dependence of these freeze-out parameters and
implications of the systematics as a function of beam energy are also
explored for particle and antiparticle separately.
| On behalf of collaboration: | STAR |
|---|
Primary author
Lokesh Kumar
(National Institution of Science Education and Research)
