| Research on the elliptic flow reflects the initial overlap region shape, while theelliptic flow fluctuation research can help us understand the initial stages of heavy-ioncollisions dynamic process helps to understand the overlapping area collision occurringsubstances.Au+Au collisions at AGS energies, due to a single event has a limited number ofparticipant nucleons, the initial stages of the nuclear matter distribution overlap regionof the reaction zone center has some fluctuation, deflected in a plane that is participantplane. In this paper, the model simulated each event to determine its participants plane,the participants were calculated eccentricity, and calculate the participant planedeflection angle of the reaction plane.We use RQMD model simulates8AGeVparameters6fm collision energies of Au Au collisions, calculated under the sameenergy the same impact parameter of Au Au collisions initial eccentricity and eventsplane deflection angle fluctuations. The results showed that the same impact parameter,the participant eccentricity fluctuations bigger. We discussed further in the initialconditions of approximately equal single-event coordinate space eccentricity andelliptic flow evolution, the results show elliptic flow fluctuations larger, and coordinateeccentricity fluctuations is relatively small.At8AGeV energy simulated collision parameters6fm2000set of events resultsshow the same impact energy on the same parameters, the different participants in theeccentricity causes the evolution of elliptic flow difference, which reflects the initialstage of the coordinate space fluctuation (participant eccentricity) will affect theevolution of elliptic flow. Models were simulated using the RQMD Au+Au collisionsat incident energy of3AGeV,6AGeV, when the impact parameter is4fm,6fm set ofevents for each2000. Through the evolution of each group event elliptic flow analysis,we found that the shielding effect of bystander for low energy and large impactparameter of the event was obvious. |
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