Eccentricity fluctuations in an integrated hybrid approach: Influence on elliptic flow

Abstract

The effects of initial state fluctuations on elliptic flow are investigated within a (3+1)d Boltzmann + hydrodynamics transport approach. The spatial eccentricity (${\epsilon }_{\mathrm{RP}}$ and ${\epsilon }_{\mathrm{part}}$) is calculated for initial conditions generated by a hadronic transport approach (UrQMD). Elliptic flow results as a function of impact parameter, beam energy and transverse momentum for two different equations of state and for averaged initial conditions or a full event-by-event setup are presented. These investigations allow the conclusion that in mid-central ($b=5-9$ fm) heavy ion collisions the final elliptic flow is independent of the initial state fluctuations and the equation of state. Furthermore, it is demonstrated that most of the $v_2$ is build up during the hydrodynamic stage of the evolution. Therefore, the use of averaged initial profiles does not contribute to the uncertainties of the extraction of transport properties of hot and dense QCD matter based on viscous hydrodynamic calculations.

7 pages, 7 figures, minor revision of figures and conclusion, as published in PRC

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• Space-time evolution of bulk QCD matter
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• Eccentricity fluctuation effects on elliptic flow in relativistic heavy ion collisions
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• Importance of Granular Structure in the Initial Conditions for the Elliptic Flow
• (3+1)-Dimensional Hydrodynamic Expansion with a Critical Point from Realistic Initial Conditions
• Directed and elliptic flow in heavy ion collisions from $E_{\mathrm{beam}}=90$ MeV/nucleon to $E_{c.m.}=200$ GeV/nucleon
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• Event-by-event hydrodynamics and elliptic flow from fluctuating initial state
• Systematic parameter study of hadron spectra and elliptic flow from viscous hydrodynamic simulations of Au+Au collisions at sqrt(s_NN) = 200 GeV
• Constraining the initial state granularity with bulk observables in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV
• Medium-modified Jets and Initial State Fluctuations as Sources of Charge Correlations Measured at RHIC
• Forward-backward elliptic anisotropy correlation in parton cascade