Temperature dependence of transport coefficients of QCD in high-energy heavy-ion collisions

TL;DR

This paper uses a new relativistic viscous hydrodynamics code to analyze how shear and bulk viscosities of quark-gluon plasma depend on temperature, based on ALICE data from high-energy Pb+Pb collisions.

Contribution

The study introduces a novel hydrodynamics simulation approach to extract temperature-dependent transport coefficients of QCD matter from experimental data.

Findings

Shear and bulk viscosities vary with temperature in quark-gluon plasma.

The analysis provides detailed insights into the bulk properties of QGP.

Final state interactions do not obscure the extraction of transport coefficients.

Abstract

Using our developed new relativistic viscous hydrodynamics code, we investigate the temperature dependence of shear and bulk viscosities from comparison with the ALICE data: single particle spectra and collective flows of Pb+Pb $\sqrt{s_{\rm NN}}=2.76$ TeV collisions at the Large Hadron Collider. We find that from the comprehensive analyses of centrality dependence of single particle spectra and collective flows we can extract detailed information on the quark-gluon plasma bulk property, without the information being smeared by the final state interactions.