Sensitivity of the Jet Quenching Observables to the Temperature Dependence of the Energy Loss

Details Sensitivity of the Jet Quenching Observables to the Temperature Dependence of the Energy Loss Sensitivity of the Jet Quenching Observables to the Temperature Dependence of the Energy Loss

2010-09-07

arxiv.org/abs/1009.1261v1

Physics

Nuclear Physics

Nuclear Theory

12 pages, 10 figures

Scientific paper

The quenching of minijet (particles with $p_T>> T, \Lambda_{QCD}$) in ultra-relativistic heavy-ion collisions has been one of the main prediction and discovery at RHIC. We analyze the correlation between different observables like the nuclear modification factor $\Rapt$, the elliptic flow and the ratio of quark to gluon suppressions. We show that the temperature (or entropy density) dependence of the in-medium energy loss strongly affects the relation among these observables. In particular the large elliptic flow and the nearly equal $\Rapt$ of quarks and gluons can be accounted for only if the energy loss occurs mainly around $T_c$ and the $q\leftrightarrow g$ conversion is significant. The use of an equation of state fitted to lattice QCD calculations, slowing down the cooling as $T \to T_c$, seems to contribute to both the enhancement of $v_2$ and the efficiency of the conversion mechanism.

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