Event-by-event fluctuations in a perturbative QCD plus saturation plus hydrodynamics model : Determining QCD matter shear viscosity in ultrarelativistic heavy-ion collisions

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Niemi , H , Eskola , K J & Paatelainen , R 2016 , ' Event-by-event fluctuations in a perturbative QCD plus saturation plus hydrodynamics model : Determining QCD matter shear viscosity in ultrarelativistic heavy-ion collisions ' Physical Review C , vol. 93 , no. 2 , 024907 . DOI: 10.1103/PhysRevC.93.024907

Title: Event-by-event fluctuations in a perturbative QCD plus saturation plus hydrodynamics model : Determining QCD matter shear viscosity in ultrarelativistic heavy-ion collisions
Author: Niemi, H.; Eskola, K. J.; Paatelainen, R.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2016-02-10
Language: eng
Number of pages: 29
Belongs to series: Physical Review C
ISSN: 2469-9985
URI: http://hdl.handle.net/10138/160980
Abstract: We introduce an event-by-event perturbative-QCD + saturation + hydro ("EKRT") framework for ultrarelativistic heavy-ion collisions, where we compute the produced fluctuating QCD-matter energy densities from next-to-leading-order perturbative QCD using a saturation conjecture to control soft-particle production and describe the space-time evolution of the QCD matter with dissipative fluid dynamics, event by event. We perform a simultaneous comparison of the centrality dependence of hadronic multiplicities, transverse momentum spectra, and flow coefficients of the azimuth-angle asymmetries against the LHC and RHIC measurements. We compare also the computed event-by-event probability distributions of relative fluctuations of elliptic flow and event-plane angle correlations with the experimental data from Pb + Pb collisions at the LHC. We show how such a systematic multienergy and multiobservable analysis tests the initial-state calculation and the applicability region of hydrodynamics and, in particular, how it constrains the temperature dependence of the shear viscosity-to-entropy ratio of QCD matter in its different phases in a remarkably consistent manner.
Subject: RELATIVISTIC NUCLEAR COLLISIONS
GLUON DISTRIBUTION-FUNCTIONS
DISSIPATIVE FLUID-DYNAMICS
PB-PB COLLISIONS
CENTRALITY DEPENDENCE
KINETIC-THEORY
ELLIPTIC FLOW
FREEZE-OUT
TRANSVERSE ENERGIES
MULTIPLICITIES
114 Physical sciences
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