How the initial fluctuation affects on the elliptic flow is investigated by investigating the rapidity, transverse 4-velocity, centrality dependencies of elliptic flow for Au+Au at 1 GeV/A with the help of an Isospin ...How the initial fluctuation affects on the elliptic flow is investigated by investigating the rapidity, transverse 4-velocity, centrality dependencies of elliptic flow for Au+Au at 1 GeV/A with the help of an Isospin Quantum Molecular Dynamics (IQMD). In addition, we compare the flow calculated with respect to participant plane created by the initial geometry in coordinate space with the flow reconstructed by the experimental event-plane method, and compare the flow with the experimental data of the FOPI collaboration. It shows that there exists some discrepancy between the flows reconstructed by the above two methods.展开更多
Sources of event-by-event elliptic flow fluctuations in relativistic heavy-ion collisions are investigated in a multiphase parton transport model （AMPT）. Besides the well-known initial eccentricity fluctuations, sev...Sources of event-by-event elliptic flow fluctuations in relativistic heavy-ion collisions are investigated in a multiphase parton transport model （AMPT）. Besides the well-known initial eccentricity fluctuations, several other sources of elliptic flow dynamical fluctuations are identified. One is fluctuations in initial parton configurations at a given eccentricity. Configuration fluctuations are found to be as important as eccentricity fluctuations in elliptic flow development. A second is quantum fluctuations in parton-parton interactions during system evolution. A third is fluctuations caused by hadronization and final-state hadronic scatterings. The magnitudes of these fluctuations are investigated relative to the eccentricity fluctuations and the average elliptic flow magnitude. The fluctuations from the latter two sources are found to be negative. The results may have important implications for the interpretation of elliptic flow data.展开更多
Within the RQMD model, space-momentum correlations, i.e. the correlations between final momentum anisotropy and initial eccentricity, are studied for 8 AGeV Au＋Au events classified according to the multi-particle azi...Within the RQMD model, space-momentum correlations, i.e. the correlations between final momentum anisotropy and initial eccentricity, are studied for 8 AGeV Au＋Au events classified according to the multi-particle azimuthal correlations. The results show that the final elliptic flow fluctuations depend on the initial collision geometry. There are clear space-momentum correlations for nucleons during the whole dynamical evolution of the collisions.展开更多
Recent measurements of event-by-event elliptic flow in Au+Au collisions at S_(NN)^(1/2)=200GeV exhibit large relative fluctuations of about 40%—50%.The data are well described by fluctuations in the shape of the init...Recent measurements of event-by-event elliptic flow in Au+Au collisions at S_(NN)^(1/2)=200GeV exhibit large relative fluctuations of about 40%—50%.The data are well described by fluctuations in the shape of the initial collision region,as estimated event-by-event with the participant eccentricity using Glauber Monte Carlo.These results,combined with the demonstrated participant eccentricity scaling of the elliptic flow across nuclear species,constitute evidence of transverse granularity in the initial matter production in these collisions.展开更多
Recent measurements of event-by-event elliptic flow in Au+Au collisions at S_(NN)^(1/2)=200GeV exhibit large relative fluctuations of about 40%—50%.The data are well described by fluctuations in the shape of the init...Recent measurements of event-by-event elliptic flow in Au+Au collisions at S_(NN)^(1/2)=200GeV exhibit large relative fluctuations of about 40%—50%.The data are well described by fluctuations in the shape of the initial collision region,as estimated event-by-event with the participant eccentricity using Glauber Monte Carlo.These results,combined with the demonstrated participant eccentricity scaling of the elliptic flow across nuclear species,constitute evidence of transverse granularity in the initial matter production in these collisions.展开更多
A new method is presented for measuring event-by-event fluctuations of elliptic flow(v_2)using first- order event planes.By studying the event-by-event distributions of v_2 observables and first-order event-plane obse...A new method is presented for measuring event-by-event fluctuations of elliptic flow(v_2)using first- order event planes.By studying the event-by-event distributions of v_2 observables and first-order event-plane observables,average flow(v_2)and event-by-event fluctuations with respect to that average can be separately determined,making appropriate allowance for the effects of finite multiplicity.The relation of flow fluctuations to eccentricity fluctuations in the initial-state participant region,as well as detector acceptance effects,are discussed.展开更多
基金Supported by National Natural Science Foundation of China(Nos.11220101005,11035009,10979074 and 11205230)Major State Basic Research Development Program in China(No.2013CB834405)
文摘How the initial fluctuation affects on the elliptic flow is investigated by investigating the rapidity, transverse 4-velocity, centrality dependencies of elliptic flow for Au+Au at 1 GeV/A with the help of an Isospin Quantum Molecular Dynamics (IQMD). In addition, we compare the flow calculated with respect to participant plane created by the initial geometry in coordinate space with the flow reconstructed by the experimental event-plane method, and compare the flow with the experimental data of the FOPI collaboration. It shows that there exists some discrepancy between the flows reconstructed by the above two methods.
基金Supported by MOST,China,under 973 Grant 2015CB856901National Natural Science Foundation of China(11521064,11547143,11228513)+2 种基金U.S.Department of Energy(DE-FG02-88ER40412)Fundamental Research Funds for the Central Universities,South-Central University for Nationalities(CZQ15001)Excellent Doctorial Dissertation Cultivation Grant from Central China Normal University(2013YBZD18)
文摘Sources of event-by-event elliptic flow fluctuations in relativistic heavy-ion collisions are investigated in a multiphase parton transport model （AMPT）. Besides the well-known initial eccentricity fluctuations, several other sources of elliptic flow dynamical fluctuations are identified. One is fluctuations in initial parton configurations at a given eccentricity. Configuration fluctuations are found to be as important as eccentricity fluctuations in elliptic flow development. A second is quantum fluctuations in parton-parton interactions during system evolution. A third is fluctuations caused by hadronization and final-state hadronic scatterings. The magnitudes of these fluctuations are investigated relative to the eccentricity fluctuations and the average elliptic flow magnitude. The fluctuations from the latter two sources are found to be negative. The results may have important implications for the interpretation of elliptic flow data.
基金Supported by Science Foundation of Harbin Institute of Technology (HIT.2002.47, HIT.2003.33)
文摘Within the RQMD model, space-momentum correlations, i.e. the correlations between final momentum anisotropy and initial eccentricity, are studied for 8 AGeV Au＋Au events classified according to the multi-particle azimuthal correlations. The results show that the final elliptic flow fluctuations depend on the initial collision geometry. There are clear space-momentum correlations for nucleons during the whole dynamical evolution of the collisions.
文摘Recent measurements of event-by-event elliptic flow in Au+Au collisions at S_(NN)^(1/2)=200GeV exhibit large relative fluctuations of about 40%—50%.The data are well described by fluctuations in the shape of the initial collision region,as estimated event-by-event with the participant eccentricity using Glauber Monte Carlo.These results,combined with the demonstrated participant eccentricity scaling of the elliptic flow across nuclear species,constitute evidence of transverse granularity in the initial matter production in these collisions.
基金Supported by U.S.DOE Grants DE-AC02-98CH10886,DE-FG02-93ER40802,DE-FG02-94ER40818,DE-FG02-94ER40865,DE-FG02-99ER41099,and DE-AC02-06CH11357by U.S.NSF Grants 9603486,0072204,and 0245011+2 种基金by Polish KBN Grant 1-P03B-062-27 (2004-2007)by NSC of Taiwan Contract NSC 89-2112-M-008-024by Hungarian OTKA Grant F049823
文摘Recent measurements of event-by-event elliptic flow in Au+Au collisions at S_(NN)^(1/2)=200GeV exhibit large relative fluctuations of about 40%—50%.The data are well described by fluctuations in the shape of the initial collision region,as estimated event-by-event with the participant eccentricity using Glauber Monte Carlo.These results,combined with the demonstrated participant eccentricity scaling of the elliptic flow across nuclear species,constitute evidence of transverse granularity in the initial matter production in these collisions.
文摘A new method is presented for measuring event-by-event fluctuations of elliptic flow(v_2)using first- order event planes.By studying the event-by-event distributions of v_2 observables and first-order event-plane observables,average flow(v_2)and event-by-event fluctuations with respect to that average can be separately determined,making appropriate allowance for the effects of finite multiplicity.The relation of flow fluctuations to eccentricity fluctuations in the initial-state participant region,as well as detector acceptance effects,are discussed.
