A4 Article in conference proceedings
Temperature dependence of η/s : uncertainties from the equation of state (2019)

Auvinen, J., Eskola, K. J., Huovinen, P., Niemi, H., Paatelainen, R., & Petreczky, P. (2019). Temperature dependence of η/s : uncertainties from the equation of state. In Confinement 2018 : Proceedings of the XIII Quark Confinement and the Hadron Spectrum Conference (Article 135). Sissa Medialab srl. POS Proceedings of Science, 336. https://doi.org/10.22323/1.336.0135

JYU authors or editors

Publication details

All authors or editors: Auvinen, Jussi; Eskola, Kari J.; Huovinen, Pasi; Niemi, Harri; Paatelainen, Risto; Petreczky, Peter

Parent publication: Confinement 2018 : Proceedings of the XIII Quark Confinement and the Hadron Spectrum Conference

Conference:

Place and date of conference: Maynooth University, Ireland, 31.7.-6.8.2018

Journal or series: POS Proceedings of Science

eISSN: 1824-8039

Publication year: 2019

Number in series: 336

Article number: 135

Publisher: Sissa Medialab srl

Publication country: Italy

Publication language: English

DOI: https://doi.org/10.22323/1.336.0135

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/66256

Publication is parallel published: https://arxiv.org/abs/1811.01792

Abstract

We perform a global model-to-data comparison on Au+Au collisions at √sNN = 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 (h=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 η/s, although within the confidence limits of the analysis. On the other hand, our analysis hardly constrains the temperature dependence of η/s, no matter the EoS.

Keywords: particle physics

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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 0