Pion Interferometry at RHIC: Probing a thermalized Quark-Gluon-Plasma?
Sven Soff, Steffen A. Bass, Adrian Dumitru, ;
Abstract
We calculate the Gaussian radius parameters of the pion-emitting source in high energy heavy ion collisions, assuming a first order phase transition from a thermalized Quark-Gluon-Plasma (QGP) to a gas of hadrons. Such a model leads to a very long-lived dissipative hadronic rescattering phase which dominates the properties of the two-pion correlation functions. The radii are found to depend only weakly on the thermalization time taui, the critical temperature Tc (and thus the latent heat), and the specific entropy of the QGP. The dissipative hadronic stage enforces large variations of the pion emission times around the mean. Therefore, the model calculations suggest a rapid increase of Rout/Rside as a function of KT if a thermalized QGP were formed.
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