Speaker
NIHAR R SAHOO
(Variable Energy Cyclotron Centre)
Description
To prob e the critical p oint (CP) of QCD phase transition, the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National Laboratory has
undertaken the beam energy scan program, colliding high energy heavy-ions
corresponding to baryonic chemical potentials within the range of 20 - 550
MeV. QCD based model calculations reveal that the correlation length of the
system diverges at the CP. The higher order moments (such as standard deviation ($\sigma$), skewness (S) and kurtosis ($\kappa$)) of the net-charge, net-baryon and
net-strangeness multiplicity distributions are related to the corresponding
higher order susceptibilities and also to the correlation length of the system.
The non-monotonic behavior of these higher moments as a function of colliding energy could be considered as a signal of the CP.
The STAR experiment has taken data for Au+Au collisions at 200 GeV,
62.4 GeV, 39 GeV, 27 GeV, 19.6 GeV, 11.5 GeV and 7.7 GeV center of
mass energies. Here we report the mid-rapidity measurement of the higher
order moments of the net-charge multiplicity distribution using the STAR
time projection chamber detector for above beam energies. The energy and
centrality dependence of higher moments and their products (such as $\frac{\sigma^{2}}{M}, S$\sigma$ and $\kappa\sigma^{2}$) will be presented. The data will also be compared to Poisson expectations and Hadron Resonance Gas model calculations
Primary author
NIHAR R SAHOO
(Variable Energy Cyclotron Centre)
