Speaker
Mr
NASIM MD
(Variable Energy Cyclotron Centre)
Description
One of the main goals of the STAR experiment at Relativistic Heavy
Ion Collider (RHIC) is to study the properties of the QCD
matter at extremely high energy and parton densities,
created in the heavy-ion collisions. Understanding the
partonic collectivity through the measurement of elliptic
flow ($v_{2}$) of multi-strange hadrons ($\phi$, $\Xi$ and $\Omega$)
is believed to be a sensitive way to characterize the system
created in the heavy-ion collisions. Multi-strange hadrons
freeze-out close to the quark-hadron transition temperature
predicted by lattice QCD. They also have small hadronic
interaction cross sections. Hence, the multi-strange hadrons
are expected to provide information from the partonic stage
of the evolution in heavy-ion collisions. Furthermore, the multi-strange hadron anisotropic flow in heavy-ion collisions when compared to those from $K_{s}^{0}$ and $\Lambda$, single strange valence quark carrying hadrons, will be useful for understanding the collective dynamics of the strange quarks.
In this presentation we will present the new results of elliptic flow
of multi-strange hadrons ($\phi$, $\Xi$ and $\Omega$ ) in Au+Au collisions at$\sqrt{s_{NN}}$= 200 GeV, using a high statistics data set collected in 2010 by the
STAR experiment. Centrality dependence measurements of multi-strange
hadron elliptic flow allow systematic investigation on how partonic
collectivity is developed across different sizes of collision system.
These results will be compared with the elliptic flow measurements of
light hadrons $\pi^{\pm}$, $K^{\pm}$, $p(\bar{p})$, $K^{0}_{S}$
and $\Lambda (\bar{\Lambda})$ . The centrality evolution of the number of quark
scaling of $v_{2}$ at the intermediate $p_{T}$ will be presented. The
effect of re-scattering at the late hadronic stage on elliptic flow
will be addressed using the $\phi$ and $p$ $v_{2}$ measurements at the
low transverse momentum ($p_{T}$).
Primary author
Mr
NASIM MD
(Variable Energy Cyclotron Centre)
