Azimuthal anisotropy: transition from hydrodynamic flow to jet suppression

Abstract

Measured 2nd and 4th azimuthal anisotropy coefficients v_{2,4}(N_{part}), p_T) are scaled with the initial eccentricity \varepsilon_{2,4}(N_{part}) of the collision zone and studied as a function of the number of participants N_{part} and the transverse momenta p_T. Scaling violations are observed for $p_T \alt 3$ GeV/c, consistent with a $p_T^2$ dependence of viscous corrections and a linear increase of the relaxation time with $p_T$. These empirical viscous corrections to flow and the thermal distribution function at freeze-out constrain estimates of the specific viscosity and the freeze-out temperature for two different models for the initial collision geometry. The apparent viscous corrections exhibit a sharp maximum for $p_T \agt 3$ GeV/c, suggesting a breakdown of the hydrodynamic ansatz and the onset of a change from flow-driven to suppression-driven anisotropy.

5 pages, 4 figs; submitted for publication

References in corpus (17)

• Glauber Modeling in High Energy Nuclear Collisions
• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• QCD Equation of State and Hadron Resonance Gas
• Multiplicity scaling in ideal and viscous hydrodynamics
• Has the QCD Critical Point been Signaled by Observations at RHIC ?
• The centrality dependence of elliptic flow, the hydrodynamic limit, and the viscosity of hot QCD
• Perturbative QCD Calculations of Elliptic Flow and Shear Viscosity in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV
• Eccentricity fluctuations from the Color Glass Condensate at RHIC and LHC
• Angular Dependence of Jet Quenching Indicates Its Strong Enhancement Near the QCD Phase Transition
• Eccentricity fluctuation effects on elliptic flow in relativistic heavy ion collisions
• Universality of the saturation scale and the initial eccentricity in heavy ion collisions
• Elliptic flow in transport theory and hydrodynamics
• Centrality dependence of elliptic flow and QGP viscosity
• On an exact hydrodynamic solution for the elliptic flow
• Energy loss for heavy quarks in relation to light partons; is radiative energy loss for heavy quarks anomalous?
• Scaling patterns of the suppression of ${\pi }^0$ yields in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV: links to the transport properties of the QGP

Cited by in corpus (18)

• Hydrodynamic Modeling of Heavy-Ion Collisions
• Measurements of Higher-Order Flow Harmonics in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Event-by-event shape and flow fluctuations of relativistic heavy-ion collision fireballs
• Quadrupole Anisotropy in Dihadron Azimuthal Correlations in Central $d$$+$Au Collisions at $\sqrt{s_{{}_{NN}}}$=200 GeV
• Radial and elliptic flow in Pb+Pb collisions at the Large Hadron Collider from viscous hydrodynamic
• Hydrodynamic elliptic and triangular flow in Pb-Pb collisions at sqrt(s)=2.76ATeV
• Viscous QCD matter in a hybrid hydrodynamic+Boltzmann approach
• Systematic parameter study of hadron spectra and elliptic flow from viscous hydrodynamic simulations of Au+Au collisions at sqrt(s_NN) = 200 GeV
• Collision Energy Dependence of Viscous Hydrodynamic Flow in Relativistic Heavy-Ion Collisions
• Deviation from quark-number scaling of the anisotropy parameter v_2 of pions, kaons, and protons in Au+Au collisions at sqrt(s_NN) = 200 GeV
• Initial eccentricity fluctuations and their relation to higher-order flow harmonics
• PHENIX Measurements of Higher-order Flow Harmonics in Au+Au collisions at Root_s = 200 GeV
• Flow in heavy-ion collisions - Theory Perspective
• Resonance Decay Contributions to Higher-Order Anisotropic Flow Coefficients
• Longitudinal dependence of two-particle momentum correlations from NEXSPHERIO model
• Effects of Minijets on Hadronic Spectra and Azimuthal Harmonics in Au-Au Collisions at 200 GeV
• d+Au Hadron Correlation Measurements at PHENIX
• Beam Energy Dependence of Azimuthal Anisotropy at RHIC-PHENIX