Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-02-26
Int.J.Mod.Phys.E16:1859-1863,2007
Physics
Nuclear Physics
Nuclear Experiment
6 pages, 3 figures, Poster Proceedings for Quark Matter 2006, Shanghai, China, November 14-20, 2006
Scientific paper
10.1142/S0218301307007118
Multiparticle production at high energies is described in terms of color strings stretched between the projectile and target. As the string density increases, overlap in the transverse plane leads to cluster formation. At some critical density a macroscopic cluster appears, spanning the entire system. This marks the percolation phase transition. Data from $\sqrt{s_{NN}}$ = 200 GeV p+p, d+Au and Au+Au collisions at RHIC has been analyzed using the STAR detector to obtain the percolation density parameter, $\eta$. The particle p$_{T}$ spectrum from 200 GeV p+p data is parameterized using a power law. Values of the fit parameters are used in the d+Au and Au+Au analysis. For 200 GeV Au+Au collisions, the value of $\eta$ is found to lie above the critical percolation threshold, while for other collision systems and energies, it is below the critical value. This supports the idea of string percolation, which at high enough string density is a possible mechanism to explore the hadronic phase transition to a quark-gluon plasma.
Scharenberg Rolf
Srivastava Brijesh
Tarnowsky Terence
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