Effects of initial state fluctuations in the final state elliptic flow measurements using the NeXSPheRIO model

2011/10/31 by Rafael Derradi de Souza, R. Derradi de Souza, Jun Takahashi +5 · 20 citations
Physics and Astronomy · #Center of mass (relativistic) #Eccentricity (behavior) #Elliptic flow #Energy–momentum relation #Flow (mathematics) #Heavy ion #High-Energy Particle Collisions Research #Impact parameter #Initial value problem #Ion #Mechanics #Nuclear physics #Observable #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Statistical physics #Transverse plane #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.85.054909

published in Physical Review C 85(5) (American Institute of Physics) · 10 pages, 13 figures, updated version based on PRC referee's comments

arxiv created 2012/04/27 · openalex publication_date 2012/05/16 · arxiv updated 2012/06/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We present a systematic study of the effects from initial condition fluctuations in systems formed by heavy-ion collisions using the hydrodynamical simulation code NeXSPheRIO. The study was based on a sample of events generated simulating Au+Au collisions at center-of-mass energy of 200 GeV per nucleon pair with an impact parameter ranging from most central to peripheral collisions. The capability of the NeXSPheRIO code to control and save the initial condition (IC) as well as the final state particles after the three-dimensional hydrodynamical evolution allows for the investigation of the sensitivity of the experimental observables to the characteristics of the early IC. Comparisons of results from simulated events generated using fluctuating initial conditions and a smooth initial condition are presented for the experimental observable elliptic flow parameter (v₂) as a function of the transverse momentum p_t and centrality. We compare v₂ values estimated using different methods, and how each method responds to the effects of fluctuations in the initial condition. Finally, we quantify the flow fluctuations and compare them to the fluctuations of the initial eccentricity of the energy density distribution in the transverse plane.

Citations

• Elliptic flow fluctuations in Au+Au collisions at
• A Measurement of Excess Antenna Temperature at 4080 Mc/s.
• NeXSPheRIO results on elliptic-flow fluctuations at RHIC
• Elliptic and Triangular Flow in Event-by-EventD=3+1Viscous Hydrodynamics
• Effect of flow fluctuations and nonflow on elliptic flow methods
• Importance of Granular Structure in the Initial Conditions for the Elliptic Flow
• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• Elliptic flow in the Gaussian model of eccentricity fluctuations
• Importance of correlations and fluctuations on the initial source eccentricity in high-energy nucleus-nucleus collisions
• Fluctuations of the Initial Conditions and the Continuous Emission in the Hydrodynamical Description of Two-Pion Interferometry
• Event-by-event hydrodynamics and elliptic flow from fluctuating initial states
• Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions