Analysis Of Intensity Interferometry Of Au+Au Non-Central Collision Events At Ampt Model

High-energy heavy ion collision experiment is the only way to study quark-gluon plasma.After collision,two ions form a reaction zone.Understanding the space-time information of the reaction zone is the basis for studying the properties of quark-gluon plasma.Because we can not understand the information of the reaction zone by direct observation,and can only measure it by indirect means.Intensity interferometry can connect the correlation function of the frozen particles with the space-time structure of the reaction zone,and plays an important role in exploring the time structure of the reaction zone.In the theoretical analysis,the reaction zone generated by the non-central collision process has spatial asymmetry.Since the intensity interferometry analysis can explore the space-time structure of the reaction zone,can it correctly reflect the spatial asymmetry.Based on this research purpose,this paper uses a multiphase transport model to numerically simulate the 11.5 Ge V Au+Au non-centered collision event in the RHIC second-phase beam scanning experiment,and analyzes the event by intensity interferometry.In this paper,the correlation function is obtained by the 2? meson correlation analysis method.The three-dimensional HBT radius of the ? meson is obtained by fitting the correlation function.The relationship between the HBT radius and the transverse mass and azimuth angle is studied.Studies have shown that as the transverse mass of ? meson increases,the three-dimensional HBT radius will gradually decrease.We believe that this phenomenon is caused by the expansion of the source.Due to the expansion of the source,the intensity interferometry detects that the source is only part of the source in the high transverse momentum range,so the radius of the HBT will gradually decrease as the transverse mass increases.In the azimuthal dependence of the HBT radius,Ro and Rs both exhibit significant oscillations.The results of both indicate that the source is an ellipse with a long axis in the x direction and a short axis in the y direction in the transverse plane.This result is consistent with the actual process,indicating that the intensity interferometry analysis can reflect the spatial asymmetry of the source in the coordinate space.Finally,this paper studies the influence of ? meson freezing time on the results of intensity interferometric analysis,analyzes the change of radius with different freezing time,studies the transverse mass dependence of HBT radius at different freezing times,and explores how the HBT radius azimuth angle dependencyrelationship changes with time.The results show that with the increase of freezing time,the radius of three-dimensional HBT increases,indicating that the source of Au+Au non-central collision is expansion.We also found that time can affect the transverse HBT radius and the transverse mass dependence.With the increase of time,the transverse HBT radius' s dependence on the transverse mass become stronger.In addition,under different freezing out time,the transverse mass dependence of HBT radius in the short axis direction is always stronger than that in the long axis direction.