Speaker
Dr
lokesh kumar
(Kent State University)
Description
The current focus at RHIC is the Beam Energy Scan (BES)
program to study the QCD phase diagram --- temperature
($T$) vs. baryon chemical potential ($\mu_B$). The BES
program aims to verify some predictions from QCD: that
a cross-over occurs at $\mu_B$ = 0, and that there exists
a first-order phase transition at large $\mu_B$ and a
critical point at an intermediate $\mu_B$. The spectra
and ratios of produced particles can be used to extract
$T$ and $\mu_B$ in different energies and system sizes.
The Solenoidal Tracker At RHIC (STAR) experiment has
collected data for Au+Au collisions at $\sqrt{s_{NN}}=$
7.7 GeV, 11.5 GeV, and 39 GeV in year 2010. One of the
advantages during the BES program was the enhanced particle
identification with availability of full Time-Of-Flight
detector. In addition, STAR collected Cu+Cu collisions at
22.4 GeV in year 2005.
We present mid-rapidity spectra ($p_{T}$ or $m_{T}-m_{0}$),
rapidity density, average transverse mass, and particle
ratios for identified hadrons from the STAR experiment.
The centrality and transverse momentum dependence of the
particle yields and ratios will be compared to existing
data at lower and higher beam energies and to various
transport models like AMPT and UrQMD. Collision dynamics
are studied systematically in the framework of chemical and
kinetic freeze-out and their properties extracted from the
particle ratios and spectra.
Author
Dr
lokesh kumar
(Kent State University)
