Acoustic scaling of anisotropic flow in shape-engineered events: implications for extraction of the specific shear viscosity of the quark gluon plasma

2013/11/07 by R. Lacey, Lacey, Roy A., D. Reynolds +12
Physics and Astronomy · #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.1311.1728

Abstract

It is shown that the acoustic scaling patterns of anisotropic flow for different event shapes at a fixed collision centrality (shape-engineered events), provide robust constraints for the event-by-event fluctuations in the initial-state density distribution from ultrarelativistic heavy ion collisions. The empirical scaling parameters also provide a dual-path method for extracting the specific shear viscosity (η/s)_QGP of the quark-gluon plasma (QGP) produced in these collisions. A calibration of these scaling parameters via detailed viscous hydrodynamical model calculations, gives (η/s)_QGP estimates for the plasma produced in collisions of Au+Au (√s_NN= 0.2 TeV) and Pb+Pb (√s_NN= 2.76 TeV). The estimates are insensitive to the initial-state geometry models considered.

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