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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Heavy Ion Collision and QCD Phases II

HK 3.2: Vortrag

Montag, 14. März 2016, 14:30–14:45, S1/01 A4

Pinning down QCD-matter shear viscosity in A+A collisions via EbyE fluctuations using pQCD + saturation + hydrodynamics — •Harri Niemi¹, Kari Eskola^2,3, Risto Paatelainen⁴, and Kimmo Tuominen^3,5 — ¹Institut fũr Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany — ²University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 University of Jyväskylä, Finland — ³Helsinki Institute of Physics, P.O.Box 64, FI-00014 University of Helsinki, Finland — ⁴Departamento de Fisica de Particulas, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Galicia, Spain — ⁵Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 University of Helsinki, Finland

We compute the initial energy densities produced in ultrarelativistic heavy-ion collisions from NLO perturbative QCD using a saturation conjecture to control soft particle production, and describe the subsequent space-time evolution of the system with hydrodynamics, event by event. The resulting centrality dependence of the low-p_T observables from this pQCD + saturation + hydro ("EKRT") framework are then compared simultaneously to the LHC and RHIC measurements. With such an analysis we can test the initial state calculation, and constrain the temperature dependence of the shear viscosity-to-entropy ratio η/s of QCD matter. Using these constraints from the current RHIC and LHC measurements we then predict the charged hadron multiplicities and flow coefficients for the 5.023 TeV Pb+Pb collisions.