Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2011-03-11
Phys.Rev.C83:054912,2011
Physics
Nuclear Physics
Nuclear Theory
added a figure and discussion; this version accepted by Phys. Rev. C
Scientific paper
10.1103/PhysRevC.83.054912
Using the newly developed hybrid model VISHNU which connects viscous hydrodynamics with a hadron cascade model, we study the differential and integrated elliptic flow v_2 at different centrality bins for 200 A GeV Au+Au collisions and 2.76 A TeV Pb+Pb collisions. We find that the average Quark Gluon Plasma (QGP) specific shear viscosity eta/s slightly increases from Relativistic Heavy Ion Collider (RHIC) to Large Hadron Collider (LHC) energies. However, a further study assuming different temperature dependencies for (eta/s)_QGP shows that one cannot uniquely constrain the form of (eta/s)_QGP(T) by fitting the spectra and v_2 alone. Based on our current understanding, the question on whether the QGP fluid is more viscous or more perfect in the temperature regime reached by LHC energies is still open.
Bass Steffen A.
Heinz Ulrich W.
Song Hui-chao
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