Elliptic flow of thermal photons and formation time of quark gluon plasma at RHIC

Details Elliptic flow of thermal photons and formation time of quark gluon plasma at RHIC Elliptic flow of thermal photons and formation time of quark gluon plasma at RHIC

2008-09-03

arxiv.org/abs/0809.0548v3

Phys.Rev.C79:021901,2009

Physics

Nuclear Physics

Nuclear Theory

2 extra figures and discussion added. To appear in Physical Review C (Rapid Communication)

Scientific paper

10.1103/PhysRevC.79.021901

We calculate the elliptic flow of thermal photons from Au+Au collisions at RHIC energies for a range of values for the formation time $\tau_0$ but fixed entropy (or particle rapidity density). The results are found to be quite sensitive to $\tau_0$. The $v_2$ for photons decreases as $\tau_0$ decreases and admits a larger contribution from the QGP phase which has a smaller $v_2$. The elliptic flow coefficient for hadrons, on the other hand, is only marginally dependent on $\tau_0$.

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