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arxiv: 1011.2783 · v2 · pith:XH2ALYYCnew · submitted 2010-11-11 · ⚛️ nucl-th · hep-ph· nucl-ex

200 A GeV Au+Au collisions serve a nearly perfect quark-gluon liquid

Huichao Song (LBNL & Ohio State) , Steffen A. Bass (Duke U.) , Ulrich W. Heinz (Ohio State) , Tetsufumi Hirano (Tokyo U. & LBNL) , Chun Shen (Ohio State) This is my paper
classification ⚛️ nucl-th hep-phnucl-ex
keywords ellipticflowmodelcollisionseccentricityeccentricity-scaledfindmeasured
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The specific shear viscosity (eta/s)_QGP of a Quark-Gluon-Plasma (QGP) at temperatures T_c < T < 2T_c is extracted from the centrality dependence of the eccentricity-scaled elliptic flow measured in ultra-relativistic heavy-ion collisions. Coupling viscous fluid dynamics for the QGP with a microscopic transport model for hadronic freeze-out we find that the eccentricity-scaled elliptic flow is a universal function of charged multiplicity per unit overlap area, (1/S)(dN_ch/dy), that depends only on the viscosity but not on the model used for computing the initial fireball eccentricity. Comparing with measurements we find 1 < (4pi)(eta/s)_QGP < 2.5 where the uncertainty range is dominated by model uncertainties for the eccentricity values used to normalize the measured elliptic flow.

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