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The QGP shear viscosity -- elusive goal or just around the corner? · Around

2011

The QGP shear viscosity -- elusive goal or just around the corner?

Shen, Chun, Bass, Steffen A, Hirano, Tetsufumi et al.

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With the new viscous hydrodynamic + hadron cascade hybrid code VISHNU, a rather precise (O(25%)) extraction of the QGP shear viscosity (eta/s)_QGP from heavy-ion elliptic flow data is possible if the initial eccentricity of the collision fireball is known with <5% accuracy.

At this point, eccentricities from initial state models differ by up to 20%, leading to an O(100%) uncertainty for (eta/s)_QGP.
It is shown that a simultaneous comparison of elliptic and triangular flow, v_2 and v_3, puts strong constraints on initial state models and can largely eliminate the present uncertainty in (eta/s)_QGP.
The variation of the differential elliptic flow v_2(p_T) for identified hadrons between RHIC and LHC energies provides additional tests of the evolution model.

Built on

Bass S A et al
1998
Earlier work this paper cites.
Heinz U 2005 Preprint
2005
Earlier work this paper cites.
Hirano T, Heinz U, Kharzeev D, Lacey R and Nara Y 2006 Phys. Lett
2006
Earlier work this paper cites.
Hirano T, Heinz U, Kharzeev D, Lacey R and Nara Y 2007 J. Phys
2007
Earlier work this paper cites.
Andrade R et al
2008
Earlier work this paper cites.

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