ICPAQGP-2010

5-10 December 2010

6th International Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP 2010)

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$\rho^{0}$ vector-meson elliptic flow ($v_{2}$) measurement in STAR experiment at RHIC

Content:

The study of elliptic flow ($v_{2}$) of the short-lived resonances provides a sensitive tool to probe the hot and dense medium produced in relativistic heavy ion collisions. It has been proposed that the measurement of $v_{2}$ of the resonances can distinguish whether the resonance was produced at hadronization via quark coalescence or later in the collision via hadron re-scattering. The $\rho^{0}$ vector-meson is one among such resonances which has a very short life time with respect to the life time of the system formed in heavy-ion collisions. Therefore, the measurement of $\rho^{0}$ $v_{2}$ can potentially provide information on the $\rho^{0}$ production mechanism in relativistic heavy-ion collisions. In the intermediate $p_{T}$ range (1.5 < $p_{T}$ < 5 GeV/c), the elliptic flow parameter $v_{2}$, shows a deviation from the particle mass ordering for different hadron species. For identified hadrons, $v_{2}$ is found to follow a scaling with the number of constituent quarks n, which is expected from the quark coalescence model. $\rho^{0}$ being a meson, its $v_{2}$ is expected to follow the $n=2$ in the universal curve of $ v_{2} (p_{T}/n) vs p_{T}/n $. On the other hand, if $\rho^{0}$ is produced from the $\pi^{+} \pi^{-}$ scattering during hadronization, it would follow the $n=4$ quark scaling (i.e. 2 for each pions). We will discuss the first time measurement of $\rho^{0}$ elliptic flow in $Cu+Cu$ and $Au+Au$ collisions at $sqrt(s_{NN}) = 200$ GeV using the STAR Time Projection Chamber (TPC) and STAR Forward Time Projection Chamber (FTPC). The methods used in this measurement will be presented in the conference.

Id:

Place:

Room: Main Auditorium

Starting date:

--not yet scheduled--

Duration:

00'

Primary Authors:

Mr. PUJAHARI, Prabhat (Indian Institute of Technology Bombay)

Presenters:

Mr. PUJAHARI, Prabhat