Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-02
Phys.Rev. C70 (2004) 024903
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 4 figures
Scientific paper
10.1103/PhysRevC.70.024903
We examine the two-pion interferometry for a granular source of quark-gluon plasma droplets. The evolution of the droplets is described by relativistic hydrodynamics with an equation of state suggested by lattice gauge results. Pions are assumed to be emitted thermally from the droplets at the freeze-out configuration characterized by a freeze-out temperature $T_f$. We find that the HBT radius $R_{out}$ decreases if the initial size of the droplets decreases. On the other hand, $R_{side}$ depends on the droplet spatial distribution and is relatively independent of the droplet size. It increases with an increase in the width of the spatial distribution and the collective-expansion velocity of the droplets. As a result, the value of $R_{out}$ can lie close to $R_{side}$ for a granular quark-gluon plasma source. The granular model of the emitting source may provide an explanation to the RHIC HBT puzzle and may lead to a new insight into the dynamics of the quark-gluon plasma phase transition.
Efaaf M. J.
Wong Cheuk-Yin
Zhang Wei-Ning
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