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

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)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 (v(2)) as a function of the transverse momentum p(t) and centrality. We compare v(2) 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.855Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)PRONEX of BrazilOffices of Nuclear Physics and High Energy Physics within the US Department of Energy Office of Science [DE-FG02-88ER40412, DE-AC02-98CH10886]Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Offices of Nuclear Physics and High Energy Physics within the US Department of Energy Office of Science [DE-FG02-88ER40412, DE-AC02-98CH10886