Has the QCD Critical Point been Signaled by Observations at RHIC ?

Details Has the QCD Critical Point been Signaled by Observations at RHIC ? Has the QCD Critical Point been Signaled by Observations at RHIC ?

2006-09-18

arxiv.org/abs/nucl-ex/0609025v5

Phys.Rev.Lett.98:092301,2007

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures. Revised version, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.98.092301

The shear viscosity to entropy ratio ($\eta/s$) is estimated for the hot and dense QCD matter created in Au+Au collisions at RHIC ($\sqrt{s_{NN}}=200$ GeV). A very low value is found $\eta/s \sim 0.1$, which is close to the conjectured lower bound ($1/4\pi$). It is argued that such a low value is indicative of thermodynamic trajectories for the decaying matter which lie close to the QCD critical end point.

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