Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions

Abstract

We explore the influence of a temperature-dependent shear viscosity over entropy density ratio $\eta /s$ on the azimuthal anisotropies v_2 and v_4 of hadrons at various rapidities. We find that in Au+Au collisions at full RHIC energy, $\sqrt{s_{NN}}=200$ GeV, the flow anisotropies are dominated by hadronic viscosity at all rapidities, whereas in Pb+Pb collisions at the LHC energy, $\sqrt{s_{NN}}=2760$ GeV, the flow coefficients are affected by the viscosity both in the plasma and hadronic phases at midrapidity, but the further away from midrapidity, the more dominant the hadronic viscosity is. We find that the centrality and rapidity dependence of the elliptic and quadrangular flows can help to distinguish different parametrizations of $(\eta /s)(T)$. We also find that at midrapidity the flow harmonics are almost independent of the decoupling criterion, but show some sensitivity to the criterion at back- and forward rapidities.

22 pages, 30 figures; corresponds to the published version, Equation (7) and typos corrected

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• DREENA-A framework as a QGP tomography tool
• Space-time structure of 3+1D color fields in high energy nuclear collisions
• Early evolution constrained by high-$p_T$ QGP tomography
• Extracting the temperature dependence in high-$p_{\perp }$ particle energy loss
• Interferometric signatures of the temperature dependence of the specific shear viscosity in heavy-ion collisions
• Bose-Einstein condensation of pions in proton-proton collisions at the Large Hadron Collider using non-extensive Tsallis statistics
• Extraction of the specific shear viscosity of quark-gluon plasma from two-particle transverse momentum correlations
• Jet-temperature anisotropy revealed through high-$p_{\perp }$ data
• Non-extensive (3+1)-dimensional hydrodynamics for relativistic heavy-ion collisions
• Effect of global momentum conservation on longitudinal flow decorrelation
• Utilizing high-$p_{\perp }$ theory and data to constrain the initial stages of quark-gluon plasma
• Measurement of forward charged hadron flow harmonics in peripheral PbPb collisions at $\sqrt{s_{NN}}=5.02$ TeV with the LHCb detector
• Pseudorapidity dependence of anisotropic flow and its decorrelations using long-range multiparticle correlations in Pb-Pb and Xe-Xe collisions
• Hybrid model with viscous relativistic hydrodynamics: a role of constraints on the shear-stress tensor