CERN Accelerating science

Article
Report number	arXiv:1811.01792
Title	Temperature dependence of $\eta/s$: uncertainties from the equation of state
Author(s)	Auvinen, Jussi (Belgrade, Inst. Phys.) ; Eskola, Kari J. (Helsinki U. ; Helsinki Inst. of Phys.) ; Huovinen, Pasi (Wroclaw U.) ; Niemi, Harri (Helsinki U. ; Helsinki Inst. of Phys.) ; Paatelainen, Risto (CERN) ; Petreczky, Péter (Brookhaven)
Publication	SISSA, 2018-11-09
Imprint	2018-11-05
Number of pages	8
Note	8 pages, 6 figures. Talk given in "XIII Quark Confinement and the Hadron Spectrum - Confinement2018", 31 July - 6 August 2018, Maynooth University, Ireland
In:	PoS Confinement2018 (2018) 135
In:	13th Quark Confinement and the Hadron Spectrum, Maynooth, Ireland, 31 Jul - 6 Aug 2018, pp.135
DOI	10.22323/1.336.0135
Subject category	nucl-th ; Nuclear Physics - Theory ; hep-ph ; Particle Physics - Phenomenology
Abstract	We perform a global model-to-data comparison on Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV and Pb+Pb collisions at $2.76$ TeV and $5.02$ TeV, using a 2+1D hydrodynamics model with the EKRT initial state and a shear viscosity over entropy density ratio $(\eta/s)(T)$ with a linear $T$ dependence. To quantify the amount of uncertainty due to the choice of the equation of state (EoS), we compare analysis results based on four different EoSs: the well known $s95p$ parametrisation, an updated parametrisation based on the same list of particles in hadron resonance gas, but using recent lattice results for the partonic part of the EoS, and two new parametrisations based on the Particle Data Group 2016 particle list and the recent lattice results. We find that the choice of the EoS does affect the favoured minimum value of $\eta/s$, although within the confidence limits of the analysis. On the other hand, our analysis hardly constrains the temperature dependence of $\eta/s$, no matter the EoS.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: (License: CC-BY-NC-ND-4.0)

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