The Simulation Research On Elliptic Flow Of Particles And Antiparticles In RHIC

High energy heavy ion collisions experiment prove a useful tool to study the property of mater with extremely density and temperature. At the highest collision energy in center of mass (?)= 200GeV, the observation of Au+Au collisions suggest that quark gluon plasma has already exist in the mater produced. In order to in depth study the property of so called QGP and the translation between hadronic gas plasma to partonic plasma mater searching for the possible critical points and the boundary of first-order phase translation. RHIC managed the beams energy scan experiment usually we means BES experiment.A clearly tendency of constituent quark scaling has been observed in hadron’s elliptic flow but we also surprised to find the violation of NCQ scaling during BES experiment with the energy range of Au+Au collision from (?)=7.7GeV to 62.4GeV. Here we use AMPT model to simulate the real collision events and try to reproduce the result of the data. We plan to study the elliptic flow of π+, π-, K+, K- and p, p in different conditions of Au+Au collisions, we also analyze the difference between particles and antiparticles.The method we used for analyzing particles elliptic was ηsub sub-event method. We show the resolution of events and the angle for event plane. We also found that default AMPT model gives lower result for particles whose transverse momentum pT>1GeV/c and string melting AMPT model with the partonic inelastic scattering cross section of 6mb could give the up values of experiment result when compare with observation of experiment and AMPT model simulations. We also noticed that string melting AMPT model with partionic inelastic cross section of 1.5mb and 3mb simulation results could well consist with the results of experiment.According to the experiment results, we choose the same condition for analyzing the data from AMPT. We picked out the particles with the 0%-80% centrality degree in minimum bias Au+Au collisions. The statistics of events reference multiparticles limited |η|< 0.5 but we analyzed the data for particles |η|<1.0 for elliptic flow.We show the elliptic flow distribution from π+, π-, K+, K- and p, p in BES experiment energy region, and study the difference between particles and antiparticles depend on transverse momentum. We found higher energy in collision could lead bigger elliptic flow, indeed. But it turns opposite impact on the difference of particles and antiparticles elliptic flow. The elliptic flow simulated by string melting AMPT model with different inelastic partionic cross section shows the bigger inelastic partionic cross section the bigger elliptic flow which consist with the experiments.The difference between the elliptic flow of particles and antiparticles with difference centrality degree shows that the result is biggest when centrality degree in 10% to 40%. But it shows different trend of elliptic flow which get higher from centrality collisions to peripheral collisions. In the fourth section we suggest hadron cascade and force decay may effect the difference elliptic flow between particles and antiparticles. We also found hadron cascade and force decay could minus the difference between the elliptic of particles and antiparticles even thought they don’t impact much on their values. The difference between K+and K becomes observably minus by the effect of force decay, the reason may correct with the smaller inelastic cross section in strong interaction.