Formation Time of QGP from Thermal Photon Elliptic Flow

Rupa Chatterjee; Dinesh K. Srivastava

doi:10.1016/j.nuclphysa.2009.10.043

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arXiv · 0907.3548

Formation Time of QGP from Thermal Photon Elliptic Flow

Rupa Chatterjee·Dinesh K. Srivastava

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Abstract

We show that the transverse momentum dependent elliptic flow $v_2(p_T)$ of thermal photons is quite sensitive to the initial formation time ($τ_0$) 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 $τ_0$ 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 $τ_0$.

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Rupa Chatterjee, Dinesh K. Srivastava. 2009-09-18. Formation Time of QGP from Thermal Photon Elliptic Flow. https://doi.org/10.1016/j.nuclphysa.2009.10.043

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