Formation Time of QGP from Thermal Photon Elliptic Flow

Details Formation Time of QGP from Thermal Photon Elliptic Flow Formation Time of QGP from Thermal Photon Elliptic Flow

2009-07-21

arxiv.org/abs/0907.3548v2

Nucl.Phys.A830:503c-506c,2009

Physics

Nuclear Physics

Nuclear Theory

4 pages, 3 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee,

Scientific paper

10.1016/j.nuclphysa.2009.10.043

We show that the transverse momentum dependent elliptic flow $v_2(p_T)$ of thermal photons is quite sensitive to the initial formation time ($\tau_0$) of Quark Gluon Plasma (QGP) for semi-central collision of gold nuclei at RHIC \cite{tau}. A smaller value of the formation time or a larger initial temperature leads to a significant increase in the thermal photon radiation from QGP phase, which has a smaller $v_2$. The elliptic flow of thermal photon is dominated by the contribution from the quark matter at intermediate and high $p_T$ range and as a result sum $v_2$ decreases with smaller $\tau_0$ for $p_T \ge 1.5$ GeV. On the other hand we find that the elliptic flow parameter for hadrons depends only marginally on the value of $\tau_0$.

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